Invitation to discrete mathematics 
Matousek, Jiri. 
 -  Clarendon Press.  1998 
 - xv, 410 pages. 
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<br/><br/><label>ISBN: </label>0-19-850207-9 
<br/><br/><label>Dewey Class. No.: </label>GS 510 M39i 1998