@misc{indiciae7805e3eaa268,
  title = {Ladders revisited.},
  author = {Biswadev Mitra and Peter A Cameron and Belinda J Gabbe},
  year = {2007},
  doi = {10.5694/j.1326-5377.2007.tb00785.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/17229031/},
  note = {Source identifier: 17229031}
}