Sy. Dobrokhotov et Ai. Shafarevich, QUANTUM SELECTION OF ISOTROPIC TORI OF PARTIALLY INTEGRABLE HAMILTONIAN-SYSTEMS IN THE QUASI-CLASSICAL APPROXIMATION, Russian journal of mathematical physics, 5(2), 1997, pp. 267-272
Conditions guaranteeing the existence of quasimodes of Schrodinger ope
rators corresponding to partially integrable Hamiltonian systems are c
onsidered. It is shown that in the situation of resonance these condit
ions distinguish a discrete family of Liouville foliations appropriate
for quantization.