@article{01409125,
title = {Small amplitude critical periods in a cubic polynomial system.},
journal = {Southwest Journal of Pure and Applied Mathematics [electronic only]},
volume = {2},
year = {1999},
pages = {1-12},
zbl = {0948.34026},
language = {en},
url = {http://dml.mathdoc.fr/item/01409125}
}
Toni, Bourama. Small amplitude critical periods in a cubic polynomial system.. Southwest Journal of Pure and Applied Mathematics [electronic only], Tome 2 (1999) pp. 1-12. http://gdmltest.u-ga.fr/item/01409125/