@misc{indiciae83cd10f68d09,
  title = {Strings in background fields: beta functions and vertex operators.},
  author = {de Alwis SP},
  year = {1986},
  doi = {10.1103/physrevd.34.3760},
  url = {https://pubmed.ncbi.nlm.nih.gov/9957120/},
  note = {Source identifier: 9957120}
}