TY  - RPRT
TI  - Exact solutions to operator differential equations.
AU  - CM Bender
AU  - GV Dunne
PY  - 1989
DO  - 10.1103/physrevd.40.2739
UR  - https://pubmed.ncbi.nlm.nih.gov/10012126/
ID  - 10012126
ER  -