@misc{indiciae283fc97f14d8,
  title = {Computer analysis of labor progression. 3. Pattern variations by parity.},
  author = {E A Friedman and B H Kroll},
  year = {1971},
  url = {https://pubmed.ncbi.nlm.nih.gov/4938465/},
  note = {Source identifier: 4938465}
}