TY  - RPRT
TI  - Perturbed ladder operator method: An algebraic recursive solution of perturbed wave equations.
AU  - N Bessis
AU  - G Bessis
PY  - 1990
DO  - 10.1103/physreva.42.1096
UR  - https://pubmed.ncbi.nlm.nih.gov/9904132/
ID  - 9904132
ER  -