Neutrinoless double-beta decay and seesaw mechanism SamoilM. Bilenky, Amand Faessler, Walter Potzel and Fedor Šimkovic Eur. Phys. J. C, 71 9 (2011) 1754 Published online: 24 September 2011 DOI: 10.1140/epjc/s10052-011-1754-7