@misc{indiciae8a231aee80f6,
  title = {A puzzle solved.},
  author = {J H Helderman},
  year = {1999},
  doi = {10.1016/s0272-6386(99)70270-2},
  url = {https://pubmed.ncbi.nlm.nih.gov/9915280/},
  note = {Source identifier: 9915280}
}