@misc{indiciae1ddc604d3e0e,
  title = {[Evolution of smallpox in Mexico and program for its control].},
  author = {C CALDERON and R PINTADO and H CELIS},
  year = {1951},
  url = {https://pubmed.ncbi.nlm.nih.gov/14842450/},
  note = {Source identifier: 14842450}
}