Pontriagin, L. S. <br/><br/>
Foundations of combinatorial topology / 
by L. S. Pontryagin 
 - Rochester, N. Y. :  Graylock Press,  1952 
 - 99 p. ;  23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Combinatorial topology