1. Wheat JD. Harelip in Shorthorn cattle. J Hered. 1960;51:99–101.
2. Hidiroglou M. Note sur deux cas de bec de lièvre constatés parmi des veaux Shorthorn. Can J Comp Med Vet Sci. 1962;26:180.
3. Shupe JL, James LF, Balls L, Binns W, Keeler RF. A probable hereditary skeletal deformity in Hereford cattle. J Hered. 1967;58:311–3.
4. Labik K. Hereditarily conditioned anomalies of the facial part of the animal head. Acta Vet (Brno). 1972;41:167–76.
5. Mayr B, Hofecker G, Zach E, Pilz E, Themessl H, Wöckl F, Leitner K, Stur I, Schleger W. Dominanter Erbgang von Lippenkieferspalten beim Rind. Züchtungskunde. 1979;51:192.