@article{03888157, title = {Integrability of derivations of classical solutions of Dirichlet's problem for an elliptic equation.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {7}, year = {1984}, pages = {279-282}, doi = {10.1155/S0161171284000284}, zbl = {0557.35038}, language = {en}, url = {http://dml.mathdoc.fr/item/03888157} }
Hassan, M.I. Integrability of derivations of classical solutions of Dirichlet's problem for an elliptic equation.. International Journal of Mathematics and Mathematical Sciences, Tome 7 (1984) pp. 279-282. doi : 10.1155/S0161171284000284. http://gdmltest.u-ga.fr/item/03888157/