@misc{indiciae33954f08dd6b,
  title = {Marketing N.P. services.},
  author = {S Shamansky},
  doi = {10.1097/00006205-198106030-00008},
  url = {https://pubmed.ncbi.nlm.nih.gov/7231821/},
  note = {Source identifier: 7231821}
}