Kulczycki, Stefan. <br/><br/>
Non-euclidean geometry   
by Stefan Kulczycki, Tr. by Stanislaw Knapowski. 
 - New york  Pergamon Press  1961 
 - 208p. 
 - pure and applied mathematics .
<br/><br/><label>Dewey Class. No.: </label>516.9  / N61