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The concept of "relevance" in information science : a historical review
Saracevic, Tefko, (1970)
Perception of the needs for scientific and technical information in less developed countries
Saracevic, Tefko, (1980)
TOWARDS THE IDENTIFICATION AND CONTROL OF VARIABLES IN INFORMATION RETRIEVAL EXPERIMENTATION
SARACEVIC, TEFKO, (1967)