@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/