@article{04165453, title = {A duality theorem for solutions of elliptic equations.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {13}, year = {1990}, pages = {73-85}, doi = {10.1155/S0161171290000114}, zbl = {0709.35032}, language = {en}, url = {http://dml.mathdoc.fr/item/04165453} }
Blanchet, Pierre. A duality theorem for solutions of elliptic equations.. International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990) pp. 73-85. doi : 10.1155/S0161171290000114. http://gdmltest.u-ga.fr/item/04165453/