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@article{MMO_1958_7_a4, author = {V. V. Ryzhkov}, title = {Conjugate systems on multidimensional spaces}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {179--226}, publisher = {mathdoc}, volume = {7}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1958_7_a4/} }
V. V. Ryzhkov. Conjugate systems on multidimensional spaces. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 7 (1958), pp. 179-226. http://geodesic.mathdoc.fr/item/MMO_1958_7_a4/