Reference. Rank analysis of incomplete block designs: I. The method of paired comparisons [bradley1952rank]
✍️source

1952
Ralph Allan Bradley, Milton E. Terry
https://doi.org/10.2307/2334029

@article{bradley1952rank,
  title = {Rank Analysis of Incomplete Block Designs: I. The Method of Paired Comparisons},
  author = {Bradley, Ralph Allan and Terry, Milton E.},
  journal = {Biometrika},
  volume = {39},
  number = {3/4},
  pages = {324--345},
  year = {1952},
  doi = {10.2307/2334029},
  url = {https://doi.org/10.2307/2334029}
}