@misc{indiciae1ec8d72e4881,
  title = {Numerical classification method for deriving natural classes.},
  author = {D Wishart},
  year = {1969},
  doi = {10.1038/221097a0},
  url = {https://pubmed.ncbi.nlm.nih.gov/5782630/},
  note = {Source identifier: 5782630}
}