Phototelegram with a versified congratulation from M.Nemenman and N.Shkut. (With a hand-written Ershov's explanatory remark addressed to his mother.) Date: 19.04.1981 Original document language: Byelorussian Authors: Mark E. Nemenman, Nikolai V. Shkut Addressee: Andrei Petrovich Ershov
