Potential impact of sub-structure on the determination of neutrino mass hierarchy at medium-baseline reactor neutrino oscillation experimentsZhaokan Cheng, Neill Raper, Wei Wang, Chan Fai Wong and Jingbo ZhangEur. Phys. J. C, 80 12 (2020) 1112DOI: https://doi.org/10.1140/epjc/s10052-020-08664-7