Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2012). Searches for Majorana neutrinos in B- decays. Physical Review D, 85(11): 112004, pp. 1-13. doi:10.1103/PhysRevD.85.112004.