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@article{PORMA_1993__50_2_115821, author = {Artino, Ralph A.}, title = {Completely semielliptic boundary value problems}, journal = {Portugaliae mathematica}, pages = {185--192}, publisher = {mathdoc}, volume = {50}, number = {2}, year = {1993}, mrnumber = {1244499}, zbl = {0792.35028}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1993__50_2_115821/} }
Artino, Ralph A. Completely semielliptic boundary value problems. Portugaliae mathematica, Tome 50 (1993) no. 2, pp. 185-192. http://geodesic.mathdoc.fr/item/PORMA_1993__50_2_115821/