Bogdanov–Takens singularity in the simple memristive time-delay system Yingying Li, Jing Yang, Zhouchao Wei and Yongjian Liu Eur. Phys. J. Special Topics, 228 10 (2019) 2093-2100 Published online: 14 October 2019 DOI: 10.1140/epjst/e2019-900010-7