@misc{indiciaec2ceb2258b8e,
  title = {The circular reference system revisited.},
  author = {Z Z Zao},
  year = {1984},
  doi = {10.1016/s0022-0736(84)80068-0},
  url = {https://pubmed.ncbi.nlm.nih.gov/6481283/},
  note = {Source identifier: 6481283}
}