@article{04189531,
title = {Limit cycles in a Kolmogorov-type model.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {13},
year = {1990},
pages = {555-566},
doi = {10.1155/S0161171290000795},
zbl = {0721.92017},
language = {en},
url = {http://dml.mathdoc.fr/item/04189531}
}
Huang, Xun-Cheng. Limit cycles in a Kolmogorov-type model.. International Journal of Mathematics and Mathematical Sciences, Tome 13 (1990) pp. 555-566. doi : 10.1155/S0161171290000795. http://gdmltest.u-ga.fr/item/04189531/