Cardini, A., Diniz Filho, J., Polly, P., & Elton, S. (2010). Chapter 8: Biogeographic analysis using geometric morphometrics: clines in skull size and shape in a widespread African arboreal monkey. In Morphometrics for Nonmorphometricians (191-217). Springer Berlin Heidelberg. https://doi.org/10.1007/978-3-540-95853-6_8