[Cephalometric tracings in Down's syndrome and their ethnic variability]. Gola G, Schirru M, Gaggero M. Parodontol Stomatol (Nuova). 1986 May-Aug;25(2):7-13. PMID: 2950369
A racial comparison of morphology in the lower extremity: a preliminary study. Benard MA, Stephens DG. J Am Podiatry Assoc. 1979 May;69(5):287-95. doi: 10.7547/87507315-69-5-287. PMID: 448022