TY - JOUR AU - Xiang-Ke Chang AU - Xing-Biao Hu AU - Hongchuan Lei AU - Yeong-Nan Yeh TI - Combinatorial proofs of addition formulas JO - The electronic journal of combinatorics PY - 2016 VL - 23 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.37236/4793/ DO - 10.37236/4793 ID - 10_37236_4793 ER -