TY  - RPRT
TI  - Ermakov systems, exact solution, and geometrical angles and phases.
AU  - M Maamache
PY  - 1995
DO  - 10.1103/physreva.52.936
UR  - https://pubmed.ncbi.nlm.nih.gov/9912331/
ID  - 9912331
ER  -