@misc{indiciae7129a3f1cd7f,
  title = {Monotone Approximation in Dynamic Programming and the Calculus of Variations.},
  author = {R Bellman},
  year = {1954},
  doi = {10.1073/pnas.40.11.1073},
  url = {https://pubmed.ncbi.nlm.nih.gov/16578439/},
  note = {Source identifier: 16578439}
}