Waller, B.M., Peirce, K., Caeiro, C.C., Scheider, L., Burrows, A.M., McCune, S., & Kaminski, J. (2013). Paedomorphic facial expressions give dogs a selective advantage. PloS one, 8(12), e82686. View Article

Waller, B. M., Caeiro, C. C., & Davila-Ross, M. (2015). Orangutans modify facial displays depending on recipient attention. PeerJ, 3, e827. View Article

Caeiro, C.C., Waller, B.M., Burrows, A.M., Zimmermann, E., Davila-Ross, M. (2013). OrangFACS: A muscle-based coding system for orangutan facial movements. International Journal of Primatology, 34(1), 115-129. View Article

Waller, B.M., Kuchenbuch, P., Lembeck, M., Burrows, A.M. & Liebal, K. (2012). GibbonFACS: A muscle based coding system for the hylobatids. International Journal of Primatology, 33(4), 809-821. View Article

Parr, L.A., Waller, B.M., Burrows, A.M., Gothard, K.M. & Vick, S.J. (2010). MaqFACS: A muscle-based facial movement coding system for the macaque monkey. American Journal of Physical Anthropology, 143, 625-630. View Article

Vick, S.J., Waller, B.M., Parr, L.A., Smith Pasaqualini, M.C. & Bard, K.A. (2007). A cross-species comparison of facial morphology and movement in humans and chimpanzees using the facial action coding system (FACS). Journal of Nonverbal Behaviour, 31, 1-20. View Article

The Original FACS

Ekman, P. & Friesen, W.V. (1978). Facial action coding system. California: Consulting Psychology Press.

Ekman, P., Friesen, W.V. & Hager, J.C. (2002). Facial action coding system. Salt Lake City: Research Nexus.