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@article{IVM_1968_11_a14, author = {B. D. Han'zov}, title = {The {Ritz} method in the eigenvalue problem for discrete systems}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {135--139}, publisher = {mathdoc}, number = {11}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1968_11_a14/} }
B. D. Han'zov. The Ritz method in the eigenvalue problem for discrete systems. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1968), pp. 135-139. http://geodesic.mathdoc.fr/item/IVM_1968_11_a14/