• [1]

    Y. Fukuda et al (Super-Kamiokande Collaboration), Phys. Rev. Lett., 81:1562(1998), hep-ex/9807003; Q. R. Ahmad et al (SNO Collaboration), ibid. 89:011301(2002), nucl-ex/0204008.

  • [2]

    J. W. F. Valle and J. C. Romao, Neutrinos in high energy and astroparticle physics, ISBN-13:978-35274119791st Edition, (Berlin:Wiley-VCH, 2015).

  • [3]

    E. Majorana, Nuovo Cimento, 14:171(1937); G. Racah, ibid. 14:322(1937)

  • [4]

    J. Engel and J. Menndez, (2016), arXiv:1610.06548

  • [5]

    H. V. Klapdor-Kleingrothaus et al, Eur. Phys. J. A, 12:147(2001), hep-ph/0103062; A. M. Bakalyarov et al (C03-06-23.1 Collaboration), Phys. Part. Nucl. Lett., 2:77(2005); Pisma Fiz. Elem. Chast. Atom. Yadra, 2005:21(2005), hep-ex/0309016; H. V. Klapdor-Kleingrothaus and I. V. Krivosheina, Mod. Phys. Lett. A, 21:1547(2006); M. Agostini et al (GERDA Collaboration), Phys. Rev. Lett., 111:122503(2013), arXiv:1307.4720; A. Pocar (EXO-200 and nEXO Collaborations), Nucl. Part. Phys. Proc., 265-266:42(2015); Y. Gando (KamLAND-Zen Collaboration), Nucl. Part. Phys. Proc., 273-275:1842(2016); A. Gando et al (KamLAND-Zen Collaboration), Phys. Rev. Lett., 117:082503(2016); 117:109903(2016), arXiv:1605.02889

  • [6]

    F. F. Deppisch, P. S. Bhupal Dev, and A. Pilaftsis, New J. Phys., 17(7):075019(2015) doi:10.1088/1367-2630/17/7/075019[arXiv:1502.06541[hep-ph]]

  • [7]

    S. Antusch, E. Cazzato, and O. Fischer, Int. J. Mod. Phys. A, 32(14):1750078(2017) doi:10.1142/S0217751X17500786[arXiv:1612.02728[hep-ph]]

  • [8]

    G. Aad et al (ATLAS Collaboration), JHEP, 1507:162(2015), arXiv:1506.06020; V. Khachatryan et al (CMS Collaboration), Phys. Lett. B, 748:144(2015), arXiv:1501.05566

  • [9]

    E. Izaguirre and B. Shuve, Phys. Rev. D, 91:093010(2015), arXiv:1504.02470

  • [10]

    G. Cvetic, C.O. Dib, and C.S. Kim, JHEP, 1206:149(2012), arXiv:1203.0573

  • [11]

    G. Anamiati, M. Hirsch, and E. Nardi, JHEP, 1610:010(2016),[arXiv:1607.05641[hep-ph]]

  • [12]

    C.O. Dib and C. S. Kim, Phys. Rev. D, 92:093009(2015), arXiv:1509.05981

  • [13]

    C.O. Dib, C.S. Kim, K. Wang, and J. Zhang, Phys. Rev. D, 94:013005(2016), arXiv:1605.01123

  • [14]

    J. C. Helo, M. Hirsch, and S. Kovalenko, Phys. Rev. D, 89:073005(2014); 93:099902(E) (2016), arXiv:1312.2900

  • [15]

    C.O. Dib and C. S. Kim, Phys. Rev. D, 89:077301(2014), arXiv:1403.1985

  • [16]

    S. Antusch, E. Cazzato, and O. Fischer, JHEP, 1612:007(2016) doi:10.1007/JHEP12(2016)007[arXiv:1604.02420[hep-ph]]

  • [17]

    P. Speckmayer, A. Hocker, J. Stelzer, and H. Voss, J. Phys. Conf. Ser., 219:032057(2010); A. Hocker et al, PoS ACAT, 040(2007), physics/0703039