@misc{indiciae174eef3e7272,
  title = {Modular-invariant closed-string field theory.},
  author = {M Kaku and J Lykken},
  year = {1988},
  doi = {10.1103/physrevd.38.3067},
  url = {https://pubmed.ncbi.nlm.nih.gov/9959052/},
  note = {Source identifier: 9959052}
}