TY  - RPRT
TI  - Algebraic time-ordering techniques and harmonic oscillator with time-dependent frequency.
AU  - G Dattoli
AU  - S Solimeno
AU  - A Torre
PY  - 1986
DO  - 10.1103/physreva.34.2646
UR  - https://pubmed.ncbi.nlm.nih.gov/9897578/
ID  - 9897578
ER  -