Spiegel, Eugene <br/><br/>
Incidence algebras 
Eugene Spiegel and Christopher J. O,Donnell 
 - New York:  Marcel Dekker,  1997. 
 -  ix,335p. 
<br/><br/> Includes bibliography and index 
<br/><br/><br/>eng 
<br/><br/><label>ISBN: </label>0824700368 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Incidence algebras
<br/><br/><label>Dewey Class. No.: </label>512.24  / SPI