Letter with Attachment The author sends the review about the paper by Vakarelov "Modal logics for knowledge representation systems" intended to be published in the Theoretical Computer Science. ("Where is the article?" has written by the addressee on the letter.) Date: 20.06.1988 Original document language: English Authors: Zdzislaw Pawlak Persons: E. Orlovskaya, Dimitr Vakarelov Addressee: Andrei Petrovich Ershov
