@inproceedings{Lavoura:2001nt,
  author = "Lavoura, Luis",
  title = "{Softly broken lepton numbers: an approach to maximal neutrino mixing  }",
  doi = "10.22323/1.007.0197",
  booktitle = "Proceedings of International Europhysics Conference on High Energy Physics {\textemdash} PoS(hep2001)",
  year = 2001,
  volume = "007",
  pages = "197"
}