Gluon fusion into Higgs pairs at NLO QCD and the top mass scheme J. Baglio, F. Campanario, S. Glaus, M. Mühlleitner, M. Spira and J. Streicher Eur. Phys. J. C, 79 6 (2019) 459 Published online: 30 May 2019 DOI: 10.1140/epjc/s10052-019-6973-3