TY  - RPRT
TI  - On a variational formula for the principal eigenvalue for operators with maximum principle.
AU  - M D Donsker
AU  - S R Varadhan
PY  - 1975
DO  - 10.1073/pnas.72.3.780
UR  - https://pubmed.ncbi.nlm.nih.gov/16592231/
ID  - 16592231
ER  -