Sachkov, Vladimir N. <br/><br/>
Combinatorial methods in discrete mathematics 

 - Cambridge  CUP.  1977 
 - xiii,306p.  23 cm. 
 - Encyclopedia of mathematics and its applications .
<br/><br/><label>ISBN: </label>0521455138 
<br/><br/><label>Dewey Class. No.: </label>511.6,  / D, sac