Gordevskyy, V. D. 2020. “V. D. Gordevskyy. On His 70th Birthday.”. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics 91 (June), 45-46. https://doi.org/10.26565/2221-5646-2020-91-04.