Geodesic
Collective obituary. Sergey A.~Kuleshov (24.12.1962 -- 15.05.2021)
Matematičeskoe obrazovanie, Tome 98 (2021) no. 2, pp. 2-4.

Voir la notice de l'article provenant de la source Math-Net.Ru

On May 15, 2021, after a serious long illness, the mathematician-algebraist, doctor of physical and mathematical sciences, permanent employee of our journal Sergey Alekseevich Kuleshov died. Here is a collective obituary including a description of his scientific results. 
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     author = {A. G. Kuznetsov and D. O. Orlov and N. A. Tyurin and A. L. Gorodentsev and V. M. Imaykin and S. I. Komarov},
     title = {Collective obituary. {Sergey} {A.~Kuleshov} (24.12.1962 -- 15.05.2021)},
     journal = {Matemati\v{c}eskoe obrazovanie},
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A. G. Kuznetsov; D. O. Orlov; N. A. Tyurin; A. L. Gorodentsev; V. M. Imaykin; S. I. Komarov. Collective obituary. Sergey A.~Kuleshov (24.12.1962 -- 15.05.2021). Matematičeskoe obrazovanie, Tome 98 (2021) no. 2, pp. 2-4. http://geodesic.mathdoc.fr/item/MO_2021_98_2_a0/