@misc{indiciaeffa9ef9ccc04,
  title = {Operator formulation of superstring multiloop amplitudes.},
  author = {ZF Ezawa and A Tezuka and K Harada and S Watamura},
  year = {1990},
  doi = {10.1103/physrevd.42.2704},
  url = {https://pubmed.ncbi.nlm.nih.gov/10013141/},
  note = {Source identifier: 10013141}
}