@article{SLC_1987_18_a4,
     author = {Gareth A. Jones},
     title = {The {Farey} {Graph}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1987},
     volume = {18},
     url = {http://geodesic.mathdoc.fr/item/SLC_1987_18_a4/}
}