Han, M., and Zhu, H., 2007: The Loop Quantities and Bifurcations of Homoclinic Loops. J. Differential Equations. Vol. 234 (2), p. 339-359
Han, M., and Zhu, H., 2007: The Loop Quantities and Bifurcations of Homoclinic Loops. J. Differential Equations. Vol. 234 (2), p. 339-359