@article{MS2_1973__33_166317,
     author = {F. Harary and P.C. Kainen and A.J. Schwenk},
     title = {A {Maximal} {Toroidal} {Graph} which is not a {Triangulation.}},
     journal = {Mathematica Scandinavica},
     pages = {108--112},
     publisher = {mathdoc},
     volume = {33},
     year = {1973},
     zbl = {0271.05108},
     url = {http://geodesic.mathdoc.fr/item/MS2_1973__33_166317/}
}