TY - JOUR T1 - On the number of families of periodic solutions of a Hamiltonian system near equilibrium. II. (English. Italian summary) JF - Boll. Un. Mat. Ital. B (7) 3 (1989), no. 3, 579-590 Y1 - 1989 A1 - Gianfausto Dell'Antonio A1 - Biancamaria D'Onofrio PB - SISSA Library UR - http://hdl.handle.net/1963/609 U1 - 3295 U2 - Mathematics U3 - Mathematical Physics ER -