1. Su un problema di vincoli unilaterali per l'equazione non omogenea delia corda vibrante;Amerio;Inst. Appl. Calc. Mauro Picone Publ. Ser. D 109,1976
2. On the motion of a string through a moving ring with a continuously variable diameter;Amerio;Atti Accad. Naz. Lincei Rend.,1977
3. Study of the motion of a string vibrating against an obstacle;Amerio;Rend. Mat.,1975
4. Survey lectures on the mathematical foundations of the finite element method;Babuska,1972
5. Mouvement d'une corde vibrante soumise à un frottement solide;Cabannes;C.R. Acad. Sci. Paris,1978