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@article{TM_1976_142_a3, author = {A. V. Bitsadze}, title = {On the theory of systems of partial differential equations}, journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova}, pages = {67--77}, publisher = {mathdoc}, volume = {142}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/TM_1976_142_a3/} }
A. V. Bitsadze. On the theory of systems of partial differential equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Number theory, mathematical analysis and their applications, Tome 142 (1976), pp. 67-77. http://geodesic.mathdoc.fr/item/TM_1976_142_a3/