@article{JIS_2014__17_1_a6,
     author = {Ferrari,  Luca and Munarini,  Emanuele},
     title = {Enumeration of edges in some lattices of paths},
     journal = {Journal of integer sequences},
     year = {2014},
     volume = {17},
     number = {1},
     zbl = {1292.05024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2014__17_1_a6/}
}