@misc{indiciaef26b7ce1eedd,
  title = {Quantum phase transitions in matrix product systems.},
  author = {Michael M Wolf and Gerardo Ortiz and Frank Verstraete and J Ignacio Cirac},
  year = {2006},
  doi = {10.1103/physrevlett.97.110403},
  url = {https://pubmed.ncbi.nlm.nih.gov/17025865/},
  note = {Source identifier: 17025865}
}