@misc{indiciae390560fe0753,
  title = {Canonical quantization of closed-superstring fields.},
  author = {W Hua},
  year = {1989},
  doi = {10.1103/physrevd.39.544},
  url = {https://pubmed.ncbi.nlm.nih.gov/9959668/},
  note = {Source identifier: 9959668}
}