@misc{indiciaeac5296b6355f,
  title = {Combinatorics of boundaries in string theory.},
  author = {J Polchinski},
  year = {1994},
  doi = {10.1103/physrevd.50.r6041},
  url = {https://pubmed.ncbi.nlm.nih.gov/10017643/},
  note = {Source identifier: 10017643}
}