@article{SLC_1993_31_a3,
     author = {Elena Barcucci and Alberto Del Lungo and Renzo Pinzani and Renzo Sprugnoli},
     title = {La hauteur des polyominos dirig\'es verticalement convexe},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {31},
     year = {1993},
     url = {http://geodesic.mathdoc.fr/item/SLC_1993_31_a3/}
}