@article{GDZPPN002202077,
title = {The periods of the Volterra-Lotka system.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {346},
year = {1984},
pages = {129-138},
zbl = {0547.92011},
url = {http://dml.mathdoc.fr/item/GDZPPN002202077}
}
Rothe, Franz. The periods of the Volterra-Lotka system.. Journal für die reine und angewandte Mathematik, Tome 346 (1984) pp. 129-138. http://gdmltest.u-ga.fr/item/GDZPPN002202077/