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Algebraická teorie automatů / Marie Demlová, Václav Koubek . Praha :  Stát. nakl. techn. lit. , 1990 . 287 s . [4, of that borrowed 0]

Terrain Evaluation : an introductory handbook to the history, principles, and methods of practical terrain assessment / Colin W. Mitchell . New York :  Longman Scientific and Technical , 1991 . 441 s . ISBN 0-582-30122-X . [1, of that borrowed 0]