@misc{indiciae0480fb240db8,
  title = {Problems in working with dynamic groups.},
  author = {N E Zinberg and L J Friedman},
  year = {1967},
  doi = {10.1080/00207284.1967.11507739},
  url = {https://pubmed.ncbi.nlm.nih.gov/6074777/},
  note = {Source identifier: 6074777}
}