Ladyzhenskaya, Olga A. <br/><br/>
Linear and quasilinear elliptic-equations /  
Olga A. Ladyzhenskaya and Nina N. Ural'Tseva ; translated by Scripta Technica ; translation editor, Leon Ehrenpreis. 
 - New York, etc. :   Academic Press,   1968. 
 - XVIII, 495 p. ;   23 cm. 
 - Mathematics in science and engineering ;   46 .
 - Mathematics in science and engineering ;   46 .