Polish Academy of Sciences, Institute of Mathematics <br/><br/>
Discrete mathematics  / 

 - Warszawa:  Polish Scientific Publishers,  1982 
 - 224p. 
 - Banach Center Publications ; 7 .
<br/><br/><label>ISBN: </label>8301014946 
<br/><br/><label>Dewey Class. No.: </label>511.5  / P768.DM