Challenging mathematics :  a selection of secondary school mathematics problems ; edited by Peter Giblin and Ian Porteous. 

 - Oxford:   Oxford University Press,   1990.  
 - 96 p. :  ill. ;  30 cm. 
<br/><br/><label>ISBN: </label>0199143617 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics--Problems, exercises, etc.
<br/><br/><label>Dewey Class. No.: </label>510.76