Letter on a Form Pursuant to his letter of 25 September, the author asks the permission to visit the addressee's institute on 6 - 7 April, 1988, with a group of 25 students and 5 scientists. He has written the similar letters to Prof. Tseytin in Leningrad and Prof. Petrov in Moscow. Date: 18.11.1987 Original document language: English Authors: Cornelius Koster Organizations: Univer. of Nijmegen Persons: Grigori S. Tseitin Addressee: Andrei Petrovich Ershov
