@misc{indiciaeb70aa4e8869e,
  title = {Quantum phase transitions and the extended coupled cluster method.},
  author = {N E Ligterink and N R Walet and R F Bishop},
  year = {2001},
  doi = {10.1103/physreve.63.037103},
  url = {https://pubmed.ncbi.nlm.nih.gov/11308801/},
  note = {Source identifier: 11308801}
}