Vilenkin, N <br/><br/>
Combinatorial mathematics for recreation / 
by  N. Vilenkin 
 - Moscow :  MIR Publishers,  1972. 
 - 207p. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Combinatorial analysis.
<br/><br/><label>Dewey Class. No.: </label>511/.6