Ogilvy, C. Stanley, <br/><br/>
Tomorrow's math :  unsolved problems for the amateur / 
by C. Stanley Ogilvy 
 - 2nd ed. 
 - New York :  Oxford University Press,  1972 
 - 7 ,198 p. :  ill. ;  21 cm. 
<br/><br/>Index 
<br/><br/><label>ISBN: </label>0195015088 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematical recreations<br/>Mathematics--Problems, exercises, etc.