@article{02210839, title = {Localization of periodic orbits of autonomous systems based on high-order extremum conditions.}, journal = {Mathematical Problems in Engineering}, volume = {2004}, year = {2004}, pages = {277-290}, doi = {10.1155/S1024123X04311038}, zbl = {1099.34043}, language = {en}, url = {http://dml.mathdoc.fr/item/02210839} }
Starkov, Konstantin E. Localization of periodic orbits of autonomous systems based on high-order extremum conditions.. Mathematical Problems in Engineering, Tome 2004 (2004) pp. 277-290. doi : 10.1155/S1024123X04311038. http://gdmltest.u-ga.fr/item/02210839/