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@article{MMO_1974_31_a4, author = {V. A. Kondrat'ev and S. D. \`Eǐdel'man}, title = {Positive solutions of linear partial differential equations}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {85--146}, publisher = {mathdoc}, volume = {31}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1974_31_a4/} }
V. A. Kondrat'ev; S. D. Èǐdel'man. Positive solutions of linear partial differential equations. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 31 (1974), pp. 85-146. http://geodesic.mathdoc.fr/item/MMO_1974_31_a4/