SL(2, 7) representations and their relevance to neutrino physics G. Aliferis, G. K. Leontaris and N. D. Vlachos Eur. Phys. J. C, 77 6 (2017) 370 Published online: 05 June 2017 DOI: 10.1140/epjc/s10052-017-4919-1