@misc{indiciaec25747d2942a,
  title = {Density modification for macromolecular phase improvement.},
  author = {K D Cowtan and K Y Zhang},
  year = {1999},
  doi = {10.1016/s0079-6107(99)00008-5},
  url = {https://pubmed.ncbi.nlm.nih.gov/10581970/},
  note = {Source identifier: 10581970}
}