@misc{indiciae1a54f8f64445,
  title = {The next step.},
  author = {W B Hagan and A C Feldman},
  doi = {10.1016/s0197-4572(89)80177-6},
  url = {https://pubmed.ncbi.nlm.nih.gov/2583579/},
  note = {Source identifier: 2583579}
}