Croft, Hallard T. <br/><br/>
Unsolved problems in geometry / 
Hallard T. Croft, Kenneth J. Falconer, Richard K. Guy. 
 - New York :  Springer-Verlag,  c1991. 
 - xv, 198 p. :  ill. 
 - Problem books in mathematics .
 - Unsolved problems in intuitive mathematics ;  v. 2 .
 - Guy, Richard K.  Unsolved problems in intuitive mathematics ;  v. 2. .
<br/><br/><label>ISBN: </label>3540975063  
<br/><br/><label>LCCN: </label>92024215     
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geometry.