Gallo, D.M.. <br/><br/>
Lecture Notes in Mathematics: Kleinian Groups and Related Topics /  

 - 1st ed /  
 - Berlin 33 :   Springer-Verlag ,   1980 
 - p.117 :  
<br/><br/><label>ISBN: </label>3-540-11975-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B27p74,N81  / M3;1