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Scientific foreign trips
Scientific trip to Bulgaria (1979)
Preparation of the trip
Letter
Letter
Discussion of the preparation of the trip
Date: 24.05.1979
Original document language: russian
Authors: Andrei Petrovich Ershov
Organizations: Inst. of Math. and Mech. of the Bulgarien Ac. Sci.
Addressee: Petr Burnev

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