Letter The author thanks for the kind agreement with occasional applying for some publications of interest. He proposes candidature Dr.R.Sethi for substitution of Dr.Aho. (Handwritten text) Date: 21.09.1987 Original document language: English Authors: Andrei Petrovich Ershov Organizations: North-Holland Publishing Company Persons: Ravi Sethi, Alfred V. Aho Addressee: Arjen Sevenster
