TY  - RPRT
TI  - Integrability and action operators in quantum Hamiltonian systems.
AU  - V V Stepanov
AU  - G Müller
PY  - 2001
DO  - 10.1103/physreve.63.056202
UR  - https://pubmed.ncbi.nlm.nih.gov/11414985/
ID  - 11414985
ER  -