@misc{indiciae4232cc90ecd8,
  title = {FUNCTIONAL EQUATIONS AND THETA-FUNCTIONS-I.},
  author = {R Bellman},
  year = {1959},
  doi = {10.1073/pnas.45.6.853},
  url = {https://pubmed.ncbi.nlm.nih.gov/16590456/},
  note = {Source identifier: 16590456}
}