Aleksandrov, P.S. <br/><br/>
Combinational topology 

 - Rochester:   Graylock press,   1957. 
<br/><br/> vol. 1:   vol. 2: The Betti groups 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CHAINS<br/>TEORIA DE GRUPOS<br/>PRINCIPIOS DE INVARIANZA