@article{10_37236_4793,
     author = {Xiang-Ke Chang and Xing-Biao Hu and Hongchuan Lei and Yeong-Nan Yeh},
     title = {Combinatorial proofs of addition formulas},
     journal = {The electronic journal of combinatorics},
     year = {2016},
     volume = {23},
     number = {1},
     doi = {10.37236/4793},
     zbl = {1329.05027},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/4793/}
}