Klee, Victor <br/><br/>
Old and new unsolved problems in plane geometry and number theory 

 - 1st 
 - Washington  Mathematical Association of America  1991 
 - xvi,340p p. 
<br/><br/><label>ISBN: </label>0-88385-315-9 
<br/><br/><label>Subjects--Index Terms: </label>Number theory