Elementary number theory 
Ymas, Sergio E. Jr. 
 -  Ymas Publishing House.  2004 
 - 228 pages.;. 
<br/><br/>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Number theory.
<br/><br/><label>Dewey Class. No.: </label>F 510.1 Y6e 2004