@misc{indiciaea3d51ceb8a24,
  title = {Nonperturbative time-dependent classical string solutions for the closed, bosonic string.},
  author = {AR Steif},
  year = {1990},
  doi = {10.1103/physrevd.42.2150},
  url = {https://pubmed.ncbi.nlm.nih.gov/10013066/},
  note = {Source identifier: 10013066}
}