A determination of the flavor asymmetric sea quarks in the proton Wei Zhu, Rong Wang, Jianhong Ruan, Xurong Chen and Pengming Zhang Eur. Phys. J. Plus, 131 1 (2016) 6 Published online: 08 January 2016 DOI: 10.1140/epjp/i2016-16006-x