TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906 - Tuson, A.; Queloz, D.; Osborn, H. P.; Wilson, T.G.; Hooton, M.J.; Beck, M.; Lendl, M.; Olofsson, G.; Fortier, A.; Bonfanti, A.; Brandeker, A.; Buchhave, L. A.; et al. (Monthly Notices of the Royal Astronomical Society, 2023)