Gellert, W <br/><br/>
VNR concise encyclopedia of mathematics 

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 - New York  Van Nostrand Reinhold Company  1975 
 - 760p.   
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<br/><br/><label>Subjects--Index Terms: </label>Mathematics  Number theory  Set theory  Group theory  Pure mathematics  Mathematics - encyclopaedias 
<br/><br/><label>Dewey Class. No.: </label>51(03)