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@article{MMO_1968_18_a9, author = {A. D. Ioffe and V. M. Tikhomirov}, title = {Extension of variational problems}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {187--246}, publisher = {mathdoc}, volume = {18}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1968_18_a9/} }
A. D. Ioffe; V. M. Tikhomirov. Extension of variational problems. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 18 (1968), pp. 187-246. http://geodesic.mathdoc.fr/item/MMO_1968_18_a9/