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 55(2) 2012
DOI:
10.3409/azc.55_2.5
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Abstract:
test2 x ̅ x̅ x̄ or x̄
