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@article{IVM_1960_5_a5, author = {A. I. Vol'pert}, title = {On the index of the {Dirichlet} problem}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {40--42}, publisher = {mathdoc}, number = {5}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1960_5_a5/} }
A. I. Vol'pert. On the index of the Dirichlet problem. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1960), pp. 40-42. http://geodesic.mathdoc.fr/item/IVM_1960_5_a5/