TY  - RPRT
TI  - Variational perturbation theory for Markov processes.
AU  - Hagen Kleinert
AU  - Axel Pelster
AU  - Mihai V Putz
PY  - 2002
DO  - 10.1103/physreve.65.066128
UR  - https://pubmed.ncbi.nlm.nih.gov/12188804/
ID  - 12188804
ER  -