Ritow, Ira <br/><br/>
Capsule calculus 

 - Mineola  Dover Publications Inc.  2003 
 - xiii, 177 p. 
<br/><br/> 4108 08/10/2021 HBD22/8859 11/10/2021 Main Budget 
<br/><br/><label>ISBN: </label> USD 9.95 (RS 747.44) 
<br/><br/><label>Dewey Class. No.: </label>515 R513C