@article{MAN_1979__243_182816,
     author = {Wolfgang Hatzel},
     title = {Ein planarer hypohamiltonscher {Graph} mit 57 {Knoten.}},
     journal = {Mathematische Annalen},
     pages = {213--216},
     publisher = {mathdoc},
     volume = {243},
     year = {1979},
     zbl = {0396.05032},
     url = {http://geodesic.mathdoc.fr/item/MAN_1979__243_182816/}
}