Azzam، A. H. (1974). ON THE SMOOTHNESS OF THE SOLUTION OF THE FIRST BOUNDARY VALUE PROBLEM OF QUASILINEAR ELLIPTIC PARTIAL DIFFERNTIAL EQUATIONS. حولية كلية البنات، ع8 ، 31 - 34. مسترجع من http://search.mandumah.com/Record/663925
Azzam، Ahmed Hassan. "ON THE SMOOTHNESS OF THE SOLUTION OF THE FIRST BOUNDARY VALUE PROBLEM OF QUASILINEAR ELLIPTIC PARTIAL DIFFERNTIAL EQUATIONS." حولية كلية البنات ع8 (1974): 31 - 34. مسترجع من http://search.mandumah.com/Record/663925