Birkhoff Periodic Orbits for Small Perturbations of Completely Integrable Hamiltonian Systems with Nondegenerate Hessian
1994 ◽
Vol 35
(4)
◽
pp. 1532-1548
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2008 ◽
pp. 142-153
1998 ◽
Vol 5
(5)
◽
pp. 483-500
◽
1991 ◽
Vol 32
(6)
◽
pp. 1531-1536
◽
2011 ◽
Vol 48
(3)
◽
pp. 409-409
◽