@misc{indiciaea66321dd135d,
  title = {On toroidal compactification of heterotic superstrings.},
  author = {P Ginsparg},
  year = {1987},
  doi = {10.1103/physrevd.35.648},
  url = {https://pubmed.ncbi.nlm.nih.gov/9957701/},
  note = {Source identifier: 9957701}
}