Use "AND" and "OR" operators.
"AND" meaning both — e.g. castor AND chromosomes = finds documents with the terms "castor" and "chromosomes". All two terms must appear.
"OR" meaning either — e.g. castor OR chromosomes = finds documents with either the first word, the second word or both words.
Issue:
VOL 39(1) 1996
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Abstract:
This paper gives some results of the revision Hungarian Cricetinus, Allocricetus and Cricetus with which the author is presently concerned.