Multiple solutions of the forced double pendulum equation G. Fournier; M. Willem — 1989 Annales de l'I.H.P. Analyse non linéaire
Almost periodic weak solutions to forced pendulum type equations without friction. (Summary). J.-M. Belley; G. Fournier — 1992 Aequationes mathematicae
Almost periodic weak solutions to forced pendulum type equations without friction. J.-M. Belley; G. Fournier — 1992 Aequationes mathematicae
A PDE approach to certain large deviation problems for systems of parabolic equations L. C. Evans; P. E. Souganidis; G. Fournier; M. Willem — 1989 Annales de l'I.H.P. Analyse non linéaire