Higgs-boson masses and mixing matrices in the NMSSM: analysis of on-shell calculationsP. Drechsel, R. Gröber, S. Heinemeyer, M. Mühlleitner, H. Rzehak and G. WeigleinEur. Phys. J. C, 77 6 (2017) 366DOI: https://doi.org/10.1140/epjc/s10052-017-4932-4