Maxi-sizing the trilinear Higgs self-coupling: how large could it be? Luca Di Luzio, Ramona Gröber and Michael Spannowsky Eur. Phys. J. C, 77 11 (2017) 788 Published online: 21 November 2017 DOI: 10.1140/epjc/s10052-017-5361-0