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@article{JRAM_1984__355_152689, author = {Franz Rothe}, title = {The periods of the {Volterra-Lotka} system.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {129--138}, publisher = {mathdoc}, volume = {355}, year = {1984}, zbl = {0547.92011}, url = {http://geodesic.mathdoc.fr/item/JRAM_1984__355_152689/} }
Franz Rothe. The periods of the Volterra-Lotka system.. Journal für die reine und angewandte Mathematik, Tome 355 (1984), pp. 129-138. http://geodesic.mathdoc.fr/item/JRAM_1984__355_152689/