Two Telegrams with congratulations both issued from the Lebedev Institute of Precise Mechanics and Computer Engineering. (With a hand-written Ershov's explanatory remark addressed to his mother.) Date: 20.04.1981 Original document language: Russian Authors: Boris A. Babayan, Vsevolod Sergeyevich Burtsev Organizations: IPMCE Addressee: Andrei Petrovich Ershov
