@article{SLC_2006-2007_54_a10,
     author = {G\'erard Duchamp and Marianne Flouret and Jean-Gabriel Luque},
     title = {Transitive {Hall} {Sets}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {54},
     year = {2006-2007},
     url = {http://geodesic.mathdoc.fr/item/SLC_2006-2007_54_a10/}
}