European respiratory review, ISSN 0905-9180 vol. 4, rev. no. 22, September 1994
317-342 s. : il., tab. ; 28 cm
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AND or + signifies AND operation (intersection)
OR or | signifies OR operation (union)
- negates a single word
" wraps text to signify a phrase
* at the end of a term signifies a right-side expansion
( and ) signify precedence
~N after a word signifies edit distance (fuzziness)
~N after a phrase signifies words distance