Bokai, Kirill A.

PhD in Physics and Mathematics

Moscow Institute of Physics and Technology

Saint Petersburg State University

CoLab Scopus

Publications

Citations

155

h-index

Publications

Citations

153

h-index

Laboratory of Photoelectron Spectroscopy of Quantum Functional Materials

Senior Researcher

Research interests

Condensed matter physics

By date By citations

Without own publications

By date By citations

Without own publications

By date By citations

Total publications

Total citations

151

Citations per publication

6.57

Average publications per year

2.3

Average coauthors

10.22

Publications years

2015-2024 (10 years)

h-index

i10-index

m-index

0.8

o-index

g-index

w-index

Metrics description

h-index

A scientist has an h-index if h of his N publications are cited at least h times each, while the remaining (N - h) publications are cited no more than h times each.

https://www.pnas.org/doi/full/10.1073/pnas.0507655102

i10-index

The number of the author's publications that received at least 10 links each.

https://scholar.googleblog.com/2011/11/google-scholar-citations-open-to-all.html

m-index

The researcher's m-index is numerically equal to the ratio of his h-index to the number of years that have passed since the first publication.

https://harzing.com/publications/white-papers/reflections-on-the-h-index

o-index

The geometric mean of the h-index and the number of citations of the most cited article of the scientist.

https://arxiv.org/abs/1511.01545

g-index

For a given set of articles, sorted in descending order of the number of citations that these articles received, the g-index is the largest number such that the g most cited articles received (in total) at least g² citations.

https://doi.org/10.1007/s11192-006-0144-7

w-index

If w articles of a researcher have at least 10w citations each and other publications are less than 10(w+1) citations, then the researcher's w-index is equal to w.

https://doi.org/10.1002/asi.21276

Fields of science

	1 2 3 4 5 6 7 8
General Materials Science	General Materials Science, 8, 34.78% General Materials Science 8 publications, 34.78%
General Chemistry	General Chemistry, 6, 26.09% General Chemistry 6 publications, 26.09%
Condensed Matter Physics	Condensed Matter Physics, 6, 26.09% Condensed Matter Physics 6 publications, 26.09%
Electronic, Optical and Magnetic Materials	Electronic, Optical and Magnetic Materials, 5, 21.74% Electronic, Optical and Magnetic Materials 5 publications, 21.74%
General Physics and Astronomy	General Physics and Astronomy, 5, 21.74% General Physics and Astronomy 5 publications, 21.74%
Surfaces, Coatings and Films	Surfaces, Coatings and Films, 4, 17.39% Surfaces, Coatings and Films 4 publications, 17.39%
Physical and Theoretical Chemistry	Physical and Theoretical Chemistry, 4, 17.39% Physical and Theoretical Chemistry 4 publications, 17.39%
General Chemical Engineering	General Chemical Engineering, 2, 8.7% General Chemical Engineering 2 publications, 8.7%
Atomic and Molecular Physics, and Optics	Atomic and Molecular Physics, and Optics, 2, 8.7% Atomic and Molecular Physics, and Optics 2 publications, 8.7%
Mechanical Engineering	Mechanical Engineering, 2, 8.7% Mechanical Engineering 2 publications, 8.7%
Surfaces and Interfaces	Surfaces and Interfaces, 2, 8.7% Surfaces and Interfaces 2 publications, 8.7%
General Energy	General Energy, 2, 8.7% General Energy 2 publications, 8.7%
Mechanics of Materials	Mechanics of Materials, 2, 8.7% Mechanics of Materials 2 publications, 8.7%
Materials Chemistry	Materials Chemistry, 1, 4.35% Materials Chemistry 1 publication, 4.35%
Chemistry (miscellaneous)	Chemistry (miscellaneous), 1, 4.35% Chemistry (miscellaneous) 1 publication, 4.35%
Electrical and Electronic Engineering	Electrical and Electronic Engineering, 1, 4.35% Electrical and Electronic Engineering 1 publication, 4.35%
Physics and Astronomy (miscellaneous)	Physics and Astronomy (miscellaneous), 1, 4.35% Physics and Astronomy (miscellaneous) 1 publication, 4.35%
General Mathematics	General Mathematics, 1, 4.35% General Mathematics 1 publication, 4.35%
Computer Science (miscellaneous)	Computer Science (miscellaneous), 1, 4.35% Computer Science (miscellaneous) 1 publication, 4.35%
Bioengineering	Bioengineering, 1, 4.35% Bioengineering 1 publication, 4.35%
General Engineering	General Engineering, 1, 4.35% General Engineering 1 publication, 4.35%
	1 2 3 4 5 6 7 8

Journals

	1 2 3 4
Physical Review B	Physical Review B, 4, 17.39% Physical Review B 4 publications, 17.39%
Journal of Physical Chemistry C	Journal of Physical Chemistry C, 2, 8.7% Journal of Physical Chemistry C 2 publications, 8.7%
Semiconductors	Semiconductors, 2, 8.7% Semiconductors 2 publications, 8.7%
Journal of Physical Chemistry Letters	Journal of Physical Chemistry Letters, 2, 8.7% Journal of Physical Chemistry Letters 2 publications, 8.7%
Carbon	Carbon, 1, 4.35% Carbon 1 publication, 4.35%
Nanoscale	Nanoscale, 1, 4.35% Nanoscale 1 publication, 4.35%
Surfaces and Interfaces	Surfaces and Interfaces, 1, 4.35% Surfaces and Interfaces 1 publication, 4.35%
Journal of Physics: Conference Series	Journal of Physics: Conference Series, 1, 4.35% Journal of Physics: Conference Series 1 publication, 4.35%
Chemistry of Materials	Chemistry of Materials, 1, 4.35% Chemistry of Materials 1 publication, 4.35%
ACS Nano	ACS Nano, 1, 4.35% ACS Nano 1 publication, 4.35%
Nanomaterials	Nanomaterials, 1, 4.35% Nanomaterials 1 publication, 4.35%
Applied Surface Science	Applied Surface Science, 1, 4.35% Applied Surface Science 1 publication, 4.35%
Journal of Experimental and Theoretical Physics	Journal of Experimental and Theoretical Physics, 1, 4.35% Journal of Experimental and Theoretical Physics 1 publication, 4.35%
Nanotechnology	Nanotechnology, 1, 4.35% Nanotechnology 1 publication, 4.35%
Symmetry	Symmetry, 1, 4.35% Symmetry 1 publication, 4.35%
2D Materials	2D Materials, 1, 4.35% 2D Materials 1 publication, 4.35%
Crystallography Reports	Crystallography Reports, 1, 4.35% Crystallography Reports 1 publication, 4.35%
	1 2 3 4

Publishers

	1 2 3 4 5 6
American Chemical Society (ACS)	American Chemical Society (ACS), 6, 26.09% American Chemical Society (ACS) 6 publications, 26.09%
Pleiades Publishing	Pleiades Publishing, 4, 17.39% Pleiades Publishing 4 publications, 17.39%
American Physical Society (APS)	American Physical Society (APS), 4, 17.39% American Physical Society (APS) 4 publications, 17.39%
Elsevier	Elsevier, 3, 13.04% Elsevier 3 publications, 13.04%
IOP Publishing	IOP Publishing, 3, 13.04% IOP Publishing 3 publications, 13.04%
Multidisciplinary Digital Publishing Institute (MDPI)	Multidisciplinary Digital Publishing Institute (MDPI), 2, 8.7% Multidisciplinary Digital Publishing Institute (MDPI) 2 publications, 8.7%
Royal Society of Chemistry (RSC)	Royal Society of Chemistry (RSC), 1, 4.35% Royal Society of Chemistry (RSC) 1 publication, 4.35%
	1 2 3 4 5 6

We do not take into account publications that without a DOI.
Statistics recalculated daily.

{"articlesYearsTotal":10,"articlesYearsFrom":2015,"articlesYearsTo":2024,"citationsYearsTotal":10,"citationsYearsFrom":2015,"citationsYearsTo":2024,"totalCitations":151,"totalPublications":23,"averageCitations":"6.57","averagePublicationsPerYear":"2.3","averageCoAuthors":"10.22","hIndex":8,"iTenIndex":6,"mIndex":"0.8","oIndex":"12.65","gIndex":11,"wIndex":1,"journals":{"type":"bar","data":{"show":true,"labels":["Physical Review B","Journal of Physical Chemistry C","Semiconductors","Journal of Physical Chemistry Letters","Carbon","Nanoscale","Surfaces and Interfaces","Journal of Physics: Conference Series","Chemistry of Materials","ACS Nano","Nanomaterials","Applied Surface Science","Journal of Experimental and Theoretical Physics","Nanotechnology","Symmetry","2D Materials","Crystallography Reports"],"ids":[25280,8859,14509,21963,37,228,608,3333,6428,8724,10051,12539,14872,16187,21974,22357,24474],"codes":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"imageUrls":["\/storage\/images\/resized\/nrK64iXHTzj43wMrfN1ZoUQ0vanswGzWPN45K3jA_medium.webp","\/storage\/images\/resized\/iLiQsFqFaSEx6chlGQ5fbAwF6VYU3WWa08hkss0g_medium.webp","\/storage\/images\/resized\/oZgeErrVFhuDksyqFURLvYS1wtVSBWczh001igGo_medium.webp","\/storage\/images\/resized\/iLiQsFqFaSEx6chlGQ5fbAwF6VYU3WWa08hkss0g_medium.webp","\/storage\/images\/resized\/GDnYOu1UpMMfMMRV6Aqle4H0YLLsraeD9IP9qScG_medium.webp","\/storage\/images\/resized\/leiAYcRDGTSl5B1eCnwpSGqmDEUEfDPPoYisFGhT_medium.webp","\/storage\/images\/resized\/GDnYOu1UpMMfMMRV6Aqle4H0YLLsraeD9IP9qScG_medium.webp","\/storage\/images\/resized\/LsKy6OnmmmRGcAU6CZgWQvNiP1polbaSLNrN7zqj_medium.webp","\/storage\/images\/resized\/iLiQsFqFaSEx6chlGQ5fbAwF6VYU3WWa08hkss0g_medium.webp","\/storage\/images\/resized\/iLiQsFqFaSEx6chlGQ5fbAwF6VYU3WWa08hkss0g_medium.webp","\/storage\/images\/resized\/MjH1ITP7lMYGxeqUZfkt2BnVLgjkk413jwBV97XX_medium.webp","\/storage\/images\/resized\/GDnYOu1UpMMfMMRV6Aqle4H0YLLsraeD9IP9qScG_medium.webp","\/storage\/images\/resized\/oZgeErrVFhuDksyqFURLvYS1wtVSBWczh001igGo_medium.webp","\/storage\/images\/resized\/LsKy6OnmmmRGcAU6CZgWQvNiP1polbaSLNrN7zqj_medium.webp","\/storage\/images\/resized\/MjH1ITP7lMYGxeqUZfkt2BnVLgjkk413jwBV97XX_medium.webp","\/storage\/images\/resized\/LsKy6OnmmmRGcAU6CZgWQvNiP1polbaSLNrN7zqj_medium.webp","\/storage\/images\/resized\/oZgeErrVFhuDksyqFURLvYS1wtVSBWczh001igGo_medium.webp"],"datasets":[{"label":"","data":[4,2,2,2,1,1,1,1,1,1,1,1,1,1,1,1,1],"backgroundColor":["#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6"],"percentage":[17.39,8.7,8.7,8.7,4.35,4.35,4.35,4.35,4.35,4.35,4.35,4.35,4.35,4.35,4.35,4.35,4.35],"barThickness":13}]},"options":{"indexAxis":"y","maintainAspectRatio":false,"scales":{"y":{"ticks":{"precision":0,"autoSkip":false,"font":{"family":"Montserrat"},"color":"#000000"}},"x":{"ticks":{"stepSize":null,"precision":0,"font":{"family":"Montserrat"},"color":"#000000"}}},"plugins":{"legend":{"position":"top","labels":{"font":{"family":"Montserrat"},"color":"#000000"}},"title":{"display":true,"text":"Journals","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}}}},"openAccess":{"type":"pie","data":{"show":true,"labels":["Closed access","Open access"],"datasets":[{"label":"Open access","data":[20,3],"backgroundColor":["#E5E7EB","#f68212"],"hoverOffset":4,"percentage":[86.96,13.04]}]},"options":{"plugins":{"legend":{"position":"top","labels":{"font":{"family":"Montserrat"},"color":"#000000"}},"title":{"display":true,"text":"Open access","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}}}},"publishers":{"type":"bar","data":{"show":true,"labels":["American Chemical Society (ACS)","Pleiades Publishing","American Physical Society (APS)","Elsevier","IOP Publishing","Multidisciplinary Digital Publishing Institute (MDPI)","Royal Society of Chemistry (RSC)"],"ids":[40,101,1539,17,2075,202,123],"codes":[0,0,0,0,0,0,0],"imageUrls":["\/storage\/images\/resized\/iLiQsFqFaSEx6chlGQ5fbAwF6VYU3WWa08hkss0g_medium.webp","\/storage\/images\/resized\/oZgeErrVFhuDksyqFURLvYS1wtVSBWczh001igGo_medium.webp","\/storage\/images\/resized\/nrK64iXHTzj43wMrfN1ZoUQ0vanswGzWPN45K3jA_medium.webp","\/storage\/images\/resized\/GDnYOu1UpMMfMMRV6Aqle4H0YLLsraeD9IP9qScG_medium.webp","\/storage\/images\/resized\/LsKy6OnmmmRGcAU6CZgWQvNiP1polbaSLNrN7zqj_medium.webp","\/storage\/images\/resized\/MjH1ITP7lMYGxeqUZfkt2BnVLgjkk413jwBV97XX_medium.webp","\/storage\/images\/resized\/leiAYcRDGTSl5B1eCnwpSGqmDEUEfDPPoYisFGhT_medium.webp"],"datasets":[{"label":"","data":[6,4,4,3,3,2,1],"backgroundColor":["#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6"],"percentage":[26.09,17.39,17.39,13.04,13.04,8.7,4.35],"barThickness":13}]},"options":{"indexAxis":"y","maintainAspectRatio":false,"scales":{"y":{"ticks":{"precision":0,"autoSkip":false,"font":{"family":"Montserrat"},"color":"#000000"}},"x":{"ticks":{"stepSize":null,"precision":0,"font":{"family":"Montserrat"},"color":"#000000"}}},"plugins":{"legend":{"position":"top","labels":{"font":{"family":"Montserrat"},"color":"#000000"}},"title":{"display":true,"text":"Publishers","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}}}},"quartiles":{"type":"pie","data":{"show":true,"labels":["Quartile not defined","Q1","Q2","Q3","Q4"],"datasets":[{"label":"Quartiles by SCImago","data":[1,17,1,4,0],"backgroundColor":["#E5E7EB","rgb(164, 207, 99)","rgb(232, 213, 89)","rgb(251, 163,83)","rgb(221,90,78)"],"hoverOffset":4,"percentage":[4.35,73.91,4.35,17.39,0]}]},"options":{"plugins":{"legend":{"position":"top","labels":{"font":{"family":"Montserrat"},"color":"#000000"}},"title":{"display":true,"text":"Quartiles by SCImago","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}}}},"quartilesWs":{"type":"pie","data":{"show":true,"labels":["Quartile not defined","Q1","Q2","Q3","Q4"],"datasets":[{"label":"Quartiles by WoS","data":[1,9,9,0,4],"backgroundColor":["#E5E7EB","rgb(164, 207, 99)","rgb(232, 213, 89)","rgb(251, 163,83)","rgb(221,90,78)"],"hoverOffset":4,"percentage":[4.35,39.13,39.13,0,17.39]}]},"options":{"plugins":{"legend":{"position":"top","labels":{"font":{"family":"Montserrat"},"color":"#000000"}},"title":{"display":true,"text":"Quartiles by WoS","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}}}},"subjects":{"type":"bar","data":{"show":true,"labels":["General Materials Science","General Chemistry","Condensed Matter Physics","Electronic, Optical and Magnetic Materials","General Physics and Astronomy","Surfaces, Coatings and Films","Physical and Theoretical Chemistry","General Chemical Engineering","Atomic and Molecular Physics, and Optics","Mechanical Engineering","Surfaces and Interfaces","General Energy","Mechanics of Materials","Materials Chemistry","Chemistry (miscellaneous)","Electrical and Electronic Engineering","Physics and Astronomy (miscellaneous)","General Mathematics","Computer Science (miscellaneous)","Bioengineering","General Engineering"],"ids":[50,4,49,6,43,3,16,33,48,60,63,64,72,1,40,53,56,57,58,62,70],"codes":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"imageUrls":["","","","","","","","","","","","","","","","","","","","",""],"datasets":[{"label":"","data":[8,6,6,5,5,4,4,2,2,2,2,2,2,1,1,1,1,1,1,1,1],"backgroundColor":["#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6"],"percentage":[34.78,26.09,26.09,21.74,21.74,17.39,17.39,8.7,8.7,8.7,8.7,8.7,8.7,4.35,4.35,4.35,4.35,4.35,4.35,4.35,4.35],"barThickness":13}]},"options":{"indexAxis":"y","maintainAspectRatio":false,"scales":{"y":{"ticks":{"precision":0,"autoSkip":false,"font":{"family":"Montserrat"},"color":"#000000"}},"x":{"ticks":{"stepSize":null,"precision":0,"font":{"family":"Montserrat"},"color":"#000000"}}},"plugins":{"legend":{"position":"top","labels":{"font":{"family":"Montserrat"},"color":"#000000"}},"title":{"display":true,"text":"Fields of science","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}}}},"yearsArticles":{"type":"bar","data":{"show":true,"labels":[2015,2016,2017,2018,2019,2020,2021,2022,2023,2024],"ids":[0,0,0,0,0,0,0,0,0,0],"codes":[0,0,0,0,0,0,0,0,0,0],"imageUrls":["","","","","","","","","",""],"datasets":[{"label":"Articles number","data":[1,0,0,4,5,3,2,3,3,2],"backgroundColor":["#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6"],"percentage":[4.35,0,0,17.39,21.74,13.04,8.7,13.04,13.04,8.7],"barThickness":null}]},"options":{"indexAxis":"x","maintainAspectRatio":true,"scales":{"y":{"ticks":{"precision":0,"autoSkip":false,"font":{"family":"Montserrat"},"color":"#000000"}},"x":{"ticks":{"stepSize":1,"precision":0,"font":{"family":"Montserrat"},"color":"#000000"}}},"plugins":{"legend":{"position":"top","labels":{"font":{"family":"Montserrat"},"color":"#000000"}},"title":{"display":true,"text":"Articles per year","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}}}},"yearsCitations":{"type":"bar","data":{"show":true,"labels":[2015,2016,2017,2018,2019,2020,2021,2022,2023,2024],"ids":[0,0,0,0,0,0,0,0,0,0],"codes":[0,0,0,0,0,0,0,0,0,0],"imageUrls":["","","","","","","","","",""],"datasets":[{"label":"Citations number","data":[1,2,3,7,10,27,23,36,35,7],"backgroundColor":["#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6"],"percentage":[0.66,1.32,1.99,4.64,6.62,17.88,15.23,23.84,23.18,4.64],"barThickness":null}]},"options":{"indexAxis":"x","maintainAspectRatio":true,"scales":{"y":{"ticks":{"precision":0,"autoSkip":false,"font":{"family":"Montserrat"},"color":"#000000"}},"x":{"ticks":{"stepSize":1,"precision":0,"font":{"family":"Montserrat"},"color":"#000000"}}},"plugins":{"legend":{"position":"top","labels":{"font":{"family":"Montserrat"},"color":"#000000"}},"title":{"display":true,"text":"Citations per year","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}}}},"articlesCitations":{"type":"line","data":{"show":true,"labels":[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23],"datasets":[{"label":"h-index","data":[null,20,15,15,14,13,13,9,9,7,7,6,5,5,4,4,3,3,1,1,1,0,0,0],"backgroundColor":"#BFDBFE","borderColor":["#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6"],"fill":"start","pointRadius":0,"pointHitRadius":0,"order":1},{"type":"line","label":"h-index","data":[0,1.125,2.25,3.375,4.5,5.625,6.75,7.875,9,10.125,11.25,12.375,13.5,14.625,15.75,16.875,18,19.125,20.25,21.375,22.5,23.625,24.75,25.875],"backgroundColor":"#fb7185","borderColor":"#fb7185","order":0,"fill":false,"pointRadius":[0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"pointHitRadius":[0,0,0,0,0,0,0,0,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}]},"options":{"plugins":{"legend":{"display":false},"title":{"display":true,"text":"h-index","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}},"scales":{"y":{"title":{"display":true,"text":"Citations"}},"x":{"title":{"display":true,"text":"Publications"}}}}},"hYears":{"type":"bar","data":{"show":true,"labels":[2015,2016,2017,2018,2019,2020,2021,2022,2023,2024],"ids":[0,0,0,0,0,0,0,0,0,0],"codes":[0,0,0,0,0,0,0,0,0,0],"imageUrls":["","","","","","","","","",""],"datasets":[{"label":"h-index","data":[1,1,1,1,2,4,5,7,8,8],"backgroundColor":["#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6","#3B82F6"],"percentage":[0,0,0,0,0,0,0,0,0,0],"barThickness":null}]},"options":{"indexAxis":"x","maintainAspectRatio":true,"scales":{"y":{"ticks":{"precision":0,"autoSkip":false,"font":{"family":"Montserrat"},"color":"#000000"}},"x":{"ticks":{"stepSize":1,"precision":0,"font":{"family":"Montserrat"},"color":"#000000"}}},"plugins":{"legend":{"position":"top","labels":{"font":{"family":"Montserrat"},"color":"#000000"}},"title":{"display":true,"text":"h-index per year","font":{"size":24,"family":"Montserrat","weight":600},"color":"#000000"}}}}}

This section displays the profiles of scientists registered on the platform. To display the full list, invite your colleagues to register.

Publications in common: 19

By date By citations

Bokai, Kirill A.

Research interests

Fields of science

Journals

Publishers

Usachov Dmitry

Vyalikh Denis

Tarasov Artem

Klimovskikh Ilya

Shikin A

Rybkin Artem

Chulkov Evgeny

Mikhailovskii Vladimir

Stolyarov Vasily

Rybkina A