@article{simkovic2017lambda,
  author = {{\v{S}}imkovic, F. and Stefanik, D. and Dvornicky, R.},
  title = {The lambda Mechanism of the 0v beta beta-Decay},
  journal = {Frontiers in Physics},
  publisher = {Frontiers Media SA},
  volume = {5},
  pages = {57},
  year = {2017},
  doi = {10.3389/fphy.2017.00057},
  issn = {2296-424X}
}