@misc{indiciaec9a38b20d897,
  title = {Quark singlets: Implications and constraints.},
  author = {V Barger and MS Berger and RJ Phillips},
  year = {1995},
  doi = {10.1103/physrevd.52.1663},
  url = {https://pubmed.ncbi.nlm.nih.gov/10019388/},
  note = {Source identifier: 10019388}
}