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@article{IVM_1960_6_a19, author = {S. L. Pevzner}, title = {Focal-directrix properties of curves of second order on the {Lobachevsky} plane}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {184--194}, publisher = {mathdoc}, number = {6}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1960_6_a19/} }
S. L. Pevzner. Focal-directrix properties of curves of second order on the Lobachevsky plane. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 6 (1960), pp. 184-194. http://geodesic.mathdoc.fr/item/IVM_1960_6_a19/