On the stability of strong-stability-preserving modified Patankar–Runge–Kutta schemes Juntao Huang, Thomas Izgin, Stefan Kopecz, Andreas Meister and Chi-Wang Shu ESAIM: M2AN, 57 2 (2023) 1063-1086 Published online: 12 April 2023 DOI: 10.1051/m2an/2023005