Letter The author informs that the proof-sheet of the addressee's article "Informatica" is sent. A request to correct thoroughly the text and return it not later than a week after receiving. Date: 21.09.1987 Original document language: Russian Authors: Vadim Ivanovich Bityutskov Organizations: "Sovetskaia Enciklopedia" Publishing House Addressee: Andrei Petrovich Ershov
