@article{Šimkovic:2019Bl,
  author = "Šimkovic, Fedor",
  title = "{Neutrinoless double beta decay: Theory challenges}",
  doi = "10.22323/1.337.0064",
  journal = "PoS",
  year = 2019,
  volume = "NOW2018",
  pages = "064"
}