@article{Nardi:20007g,
  author = "Nardi, Enrico",
  title = "{Horizontal $U(1)_H$ symmetry: a non-anomalous model}",
  doi = "10.22323/1.005.0023",
  journal = "PoS",
  year = 2000,
  volume = "silafae-III",
  pages = "023"
}