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@article{IVM_1968_11_a5, author = {R. M. Geidel'man}, title = {A~certain property of quadratic conjugate nets}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {48--50}, publisher = {mathdoc}, number = {11}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1968_11_a5/} }
R. M. Geidel'man. A~certain property of quadratic conjugate nets. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 11 (1968), pp. 48-50. http://geodesic.mathdoc.fr/item/IVM_1968_11_a5/