@misc{indiciaed4ed62ed4ac9,
  title = {Three-cocycle in quantum mechanics. II.},
  author = {B Grossman},
  year = {1986},
  doi = {10.1103/physrevd.33.2922},
  url = {https://pubmed.ncbi.nlm.nih.gov/9956498/},
  note = {Source identifier: 9956498}
}