@misc{indiciaecd12285f26c5,
  title = {BRST quantization of the superstring in background fields.},
  author = {A Das and J Maharana and S Roy},
  year = {1989},
  doi = {10.1103/physrevd.40.4037},
  url = {https://pubmed.ncbi.nlm.nih.gov/10011786/},
  note = {Source identifier: 10011786}
}