@article{JIS_2006__9_1_a0,
     author = {Woan,  Wen-jin},
     title = {A relation between restricted and unrestricted weighted {Motzkin} paths},
     journal = {Journal of integer sequences},
     year = {2006},
     volume = {9},
     number = {1},
     zbl = {1101.05008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2006__9_1_a0/}
}