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@article{IVM_1980_5_a11, author = {A. V. Sachenkov and M. I. Kogan}, title = {On variational equations of mixed type in elasticity theory}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {50--57}, publisher = {mathdoc}, number = {5}, year = {1980}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1980_5_a11/} }
A. V. Sachenkov; M. I. Kogan. On variational equations of mixed type in elasticity theory. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1980), pp. 50-57. http://geodesic.mathdoc.fr/item/IVM_1980_5_a11/