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Factors affecting the preferences of industrial personnel for information gathering methods
Victor Rosenberg

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Mathematical analysis of documentation systems : An attempt to a theory of classification and search request formulation
Dagobert Soergel

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The mathematical theory of context-free languages : S. Ginsburg. McGraw-Hill, New York, 1966. pp. ix + 232
H. P. Edmundson

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The advanced theory of language as choice and chance : G. Herdan. Springer-Verlag, New York, 1966. pp. xiii + 459
H. P. Edmundson