Maturana AM. A Shil’nikov’s theorem in R4 in an extended neighborhood of a saddle point of focus - focus type. Proyecciones (Antofagasta, On line) [Internet]. 2018Apr.4 [cited 2024May4];15(1):29-45. Available from: https://www.revistaproyecciones.cl/index.php/proyecciones/article/view/2702