Extensive beam test study of prototype MRPCs for the T0 detector at the CSR external-target experimentDongdong Hu, Jiaming Lu, Jian Zhou, Peipei Deng, Ming Shao, Yongjie Sun, Lei Zhao, Hongfang Chen, Cheng Li, Zebo Tang, Yifei Zhang, Yi Zhou, Wenhao You, Guofeng Song, Yitao Wu and Bing ZhuEur. Phys. J. C, 80 3 (2020) 282DOI: https://doi.org/10.1140/epjc/s10052-020-7804-2