@misc{indiciae60c482eeb02a,
  title = {Discrete analysis systems.},
  author = {B E Northam},
  year = {1969},
  doi = {10.1136/jcp.s2-3.1.42},
  url = {https://pubmed.ncbi.nlm.nih.gov/5272512/},
  note = {Source identifier: 5272512}
}