Gao, Weidong, Yuanlin Li, Jiangtao Peng, and Fang Sun. “On Subsequence Sums of a Zero-Sum Free Sequence II”. The Electronic Journal of Combinatorics 15, no. 1 (September 15, 2008): R117. Accessed March 28, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v15i1r117.