@misc{indiciae906d01787a4a,
  title = {ON THE CONTINUOUS GOLD-MINING EQUATION.},
  author = {R Bellman and S Lehman},
  year = {1954},
  doi = {10.1073/pnas.40.2.115},
  url = {https://pubmed.ncbi.nlm.nih.gov/16589427/},
  note = {Source identifier: 16589427}
}