Petters, A.O.  . <br/><br/>
Singularity theory and gravitational lensing /  
by Arlei O. Petters, Harold Levine and Joachim Wambsganss. 
 - Berlin :   Birkhauser ,   2001 
 - 603p ;  
<br/><br/><label>ISBN: </label>0-8176-3668-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B37:40aC18  / P1