Comment on "Structure of the two-neutrino double-β decay matrix elements within perturbation theory" by Dušan Štefánik, Fedor Šimkovic, Amand Faessler, arXiv:1506.00835 [nucl-th], Phys.Rev.C91 (2015) 6, 064311

Vadim Rodin, O. A. Rumyantsev, M. H. Urin

We comment on a priority claim given by the authors of Phys.Rev.C91 (2015) 6, 064311.