@article{SLC_2006-2007_54_a5,
     author = {Yvan Le Borgne},
     title = {Counting {Upper} {Interactions} in {Dyck} {Paths}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {54},
     year = {2006-2007},
     url = {http://geodesic.mathdoc.fr/item/SLC_2006-2007_54_a5/}
}