Berkeley problems in mathematics 
De Souza, Paulo Ney. 
 - 3rd ed. 
 - New York :  Springer,  2007 
 - xiv, 591 p. :  ill. ;  25 cm. 
 - Problem books in mathematics .
<br/><br/><label>ISBN: </label>0387204296 (alk. paper) | 9788181286345 (pbk. : alk. paper