Stop coannihilation in the CMSSM and SubGUT models John Ellis, Jason L. Evans, Feng Luo, Keith A. Olive and Jiaming Zheng Eur. Phys. J. C, 78 5 (2018) 425 Published online: 28 May 2018 DOI: 10.1140/epjc/s10052-018-5831-z