1. Çelik H, Yilmaz E, Atasever A, Vurgun B, Taner D (1992) Bilateral anatomical anomaly of the anterior bellies of digastric muscle. Kaibogaku Zasshi 67: 650–651
2. Hamilton WJ, Mossman HW (1972) Human Embryology, 4th edn. Williams and Wilkins, Baltimore, pp 558
3. Kosugi K, Shibata S, Yamashita H (1989) Anatomical study on the variation of the extensor muscles of human foream; the relation between diffentiation and variation. Jikeikai Med J 36:93-lll
4. Le Double AF (1897) Traité des variations du système musculaire de l’homme et de leur signification au point de vue de l’anthropologie zoologique. Reinwald, Paris, pp 126–127
5. Macalister A (1875) Observations on muscular anamalies in the human anatomy. (Third series with a catalogue of the principal muscular variations hitherto published). Trans R Irish Acad Sei 25: 1–130