@article{MAN_1989__285_1_164613,
     author = {Dino J. Lorenzini},
     title = {Arithmetical graphs.},
     journal = {Mathematische Annalen},
     pages = {481--502},
     year = {1989},
     volume = {285},
     number = {1},
     zbl = {0662.14008},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__285_1_164613/}
}