Nonlinear partial differential equations of second order 
Dong, Guangchang. 
 - Providence, R.I. :  American Mathematical Society,  1991 
 - vii, 251 p. ;  26 cm. 
 - Translations of mathematical monographs,  v. 95 .
<br/><br/> Translation of: Fei xian xing er jie pian wei fen fang cheng. | Original Chinese title on verso of t.p. 
<br/><br/><label>ISBN: </label>0821845543 (alk. paper)