@misc{indiciaef81cc2666fd2,
  title = {The Sigma Project.},
  author = {P Merry and G Wing},
  year = {1993},
  doi = {10.1108/09526869310048720},
  url = {https://pubmed.ncbi.nlm.nih.gov/10132784/},
  note = {Source identifier: 10132784}
}