Petrosyan, A., et al <br/><br/>
Regularity of free boundaries in obstacle-type problems 
A. Petrosyan, et al 
 - Providence  American Mathematical Society  2012 
 - x  221 
 - Graduate studies in mathematics 136 .
<br/><br/><label>ISBN: </label>9780821887943 
<br/><br/><label>Dewey Class. No.: </label>10.10+10.02  / PETR