On a conjecture for the critical behaviour of KAM tori. Bonetto, Federico; Gentile, Guido — 1999 Mathematical Physics Electronic Journal [electronic only]
A proof existence of whiskered tori with quasi flat homoclinic intersections in a class of almost integrable hamiltonian systems. Guido Gentile — 1995 Forum mathematicum
Lindstedt series, ultraviolet divergences and Moser's theorem Federico Bonetto; Giovanni Gallavotti; Guido Gentile; Vieri Mastropietro — 1998 Annali della Scuola Normale Superiore di Pisa - Classe di Scienze