TY  - RPRT
TI  - Monotone Approximation in Dynamic Programming and the Calculus of Variations.
AU  - R Bellman
PY  - 1954
DO  - 10.1073/pnas.40.11.1073
UR  - https://pubmed.ncbi.nlm.nih.gov/16578439/
ID  - 16578439
ER  -