1. Anuczin D. N., Revue d'Anthropol. 1883, 358.
2. Ashley-Montagu M. F., The Journ. of the Royal Anthropological Institute 1937, 47, 157.
3. Bolk L., Zeitschr. f. Morph. u. Anthropol. 1920, 21, 2, 209.
4. Borovansky L., Ass. des Anatomie, 1932, 67.
5. Bryce T. H., Young M., Journ. of Anatomy 1916, 60, 153.