Neutrinoless double-beta decay and seesaw mechanismSamoilM. Bilenky, Amand Faessler, Walter Potzel and Fedor ŠimkovicEur. Phys. J. C, 71 9 (2011) 1754DOI: https://doi.org/10.1140/epjc/s10052-011-1754-7