@article{SLC_1985_12_a0,
     author = {Pierre Duchet},
     title = {La convexit\'e dans les structures combinatoires},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {12},
     year = {1985},
     url = {http://geodesic.mathdoc.fr/item/SLC_1985_12_a0/}
}