Lekkerkerker, C.G. <br/><br/>
Geometry of numbers   
by C.G.Lekkerkerker 
 - Groningen  Wolters-Noordhoff Publishing  1969 
 - 510p. 
 - Biblotheca Mathematica  V.8 .
<br/><br/><label>ISBN: </label>7204 2108 X 
<br/><br/><label>LCCN: </label>70-97931 
<br/><br/><label>Dewey Class. No.: </label>512.5  / N699;1