Mitropolsky Yu. O., Antonishin I. O., Prikarpatsky A. K., and Samoilenko V. G. “Simplex Analysis of Dynamical Systems With a Perturbation. New Criteria of Stabilization of a Homoclinic Separatrix and Its Use”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 1 (February 4, 1992): 46-66. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2319.