@article{SLC_1984_11_a5,
     author = {Germain Kreweras},
     title = {Abz\"ahlung gewisser {Pfade} in der {Z2-Ebene}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {11},
     year = {1984},
     url = {http://geodesic.mathdoc.fr/item/SLC_1984_11_a5/}
}