@misc{indiciaed75145f4c227,
  title = {Time-evolution operator and geometric phase for a system with a su(1,1)},
  author = {JB Xu and TZ Qian and XC Gao},
  year = {1991},
  doi = {10.1103/physreva.44.1485},
  url = {https://pubmed.ncbi.nlm.nih.gov/9906109/},
  note = {Source identifier: 9906109}
}