@misc{indiciaeefe095558932,
  title = {Implications of Abelian extended gauge structures from string models.},
  author = {M Cvetic and P Langacker},
  year = {1996},
  doi = {10.1103/physrevd.54.3570},
  url = {https://pubmed.ncbi.nlm.nih.gov/10021029/},
  note = {Source identifier: 10021029}
}