Newton, Chebyshev, and Halley Basins of Attraction; A Complete Geometric Approach Bart D. Stewart (2002) Visual Mathematics
Nonhyperbolic persistent attractors near the Morse–Smale boundary Eduardo M Muñoz Morales, Bernardo San Martín Rebolledo, Jaime A Vera Valenzuela (2003) Annales de l'I.H.P. Analyse non linéaire