@misc{indiciae2b3f3f29eebb,
  title = {Combinations and comparisons.},
  author = {P C van de Kerkhof},
  doi = {10.1016/s0738-081x(97)00010-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/9313980/},
  note = {Source identifier: 9313980}
}