@misc{indiciaed5292e8ec40a,
  title = {Loop calculus for lattice gauge theories.},
  author = {R Gambini and L Leal and A Trias},
  year = {1989},
  doi = {10.1103/physrevd.39.3127},
  url = {https://pubmed.ncbi.nlm.nih.gov/9959547/},
  note = {Source identifier: 9959547}
}