S. Bouquet et Hr. Lewis, A 2ND INVARIANT FOR ONE-DEGREE-OF-FREEDOM, TIME-DEPENDENT HAMILTONIANS GIVEN A FIRST INVARIANT, Journal of mathematical physics, 37(11), 1996, pp. 5509-5517
An explicit formula for a second invariant of a one-degree-of-freedom
time-dependent Hamiltonian is derived in terms of the Hamiltonian and
an assumed first invariant. If the first invariant is expressed as a f
unction of two canonical functions, a transformation to an autonomous
Hamiltonian system is possible. (C) 1996 American Institute of Physics
.