Quantization of a one-dimensional time-dependent periodic system with   Hamiltonian and constants of motion approaches
  For a particle moving in a one-dimensional space an under a periodic external force, its quantization is study using the Hamiltonian (generalized linear momentum quantization) and constant of motion (velocity quantization) approaches. it is shown a great difference on the quantization of both approaches and the ambiguities arisen by using the quantization on the constants of motion. 
Gustavo Lopez