A method of estimating an upper bound of the number of periodic solutions of an autonomous system of two differential equations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 16 (1961) no. 3
M. I. Voilokov. A method of estimating an upper bound of the number of periodic solutions of an autonomous system of two differential equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 16 (1961) no. 3. http://geodesic.mathdoc.fr/item/RM_1961_16_3_a7/
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     author = {M. I. Voilokov},
     title = {A~method of estimating an upper bound of the number of periodic solutions of an autonomous system of two differential equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1961},
     volume = {16},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1961_16_3_a7/}
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