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@article{IVM_1993_7_a6, author = {N. G. Makeev}, title = {Multiplicity of a~focus in cubic systems}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {42--44}, publisher = {mathdoc}, number = {7}, year = {1993}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1993_7_a6/} }
N. G. Makeev. Multiplicity of a~focus in cubic systems. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (1993), pp. 42-44. http://geodesic.mathdoc.fr/item/IVM_1993_7_a6/