@misc{indiciaeed60b7214de8,
  title = {Problems in measuring reciprocity with difference scores.},
  author = {V P Tilden and B J Stewart},
  year = {1985},
  doi = {10.1177/0092055x8500700314},
  url = {https://pubmed.ncbi.nlm.nih.gov/3850705/},
  note = {Source identifier: 3850705}
}