Media type: E-Article Title: Variational perturbation theory for Markov processes Contributor: Kleinert, Hagen; Pelster, Axel; Putz, Mihai V. Published: American Physical Society (APS), 2002 Published in: Physical Review E, 65 (2002) 6 Language: English DOI: 10.1103/physreve.65.066128 ISSN: 1063-651X; 1095-3787 Origination: Footnote: