@article{SLC_1990_23_a4,
     author = {Dani\'ele Gardy and Dominique Gouyou-Beauchamps},
     title = {Enumeration of {Some} {Davenport-Schinzel} {Sequences}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {23},
     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/SLC_1990_23_a4/}
}