Ke. Thylwe et F. Bensch, SEMICLASSICAL NARROW-TUBE QUANTIZATIONS OF TIME-PERIODIC HAMILTONIAN-SYSTEMS, Journal of physics. A, mathematical and general, 27(22), 1994, pp. 7475-7490
An approximate semiclassical quantization procedure for time-periodic
Hamiltonians is formulated, which applies to motion near stable period
ic orbits of the system, corresponding to elliptic islands of the peri
od map. The theory involves canonical transformations and the use of a
particular dynamical Lewis invariant. The basic assumption in the nar
row-tube approximation is the localization of the quantal wavefunction
inside the elliptic islands.