Letter The author asks A.P. Ershov to take part in writing articles for Encyclopedia of Cybernetics and to speak at the Yu.A. Aivazyan’s thesis defence. Date: 28.02.1969 Original document language: russian Authors: Ekaterina Logvinovna Yuschenko Persons: Yu. A. Aivazyan Addressee: Andrei Petrovich Ershov
