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Periodic Oscillations of Odd 2nd Order Hamiltonian-systems

Bibliographic reference Willem, Michel. Periodic Oscillations of Odd 2nd Order Hamiltonian-systems. In: Unione Matematica Italiana. Bollettino, Vol. 3B, no. 2, p. 293-304 (1984)
Permanent URL http://hdl.handle.net/2078.1/55843