@misc{indiciae98b6caa755b4,
  title = {A ladder with rungs!},
  author = {Robert Crouch},
  year = {2004},
  doi = {10.1016/j.aaen.2004.05.002},
  url = {https://pubmed.ncbi.nlm.nih.gov/15234708/},
  note = {Source identifier: 15234708}
}