Catia Correia-Caeiro, Raquel Costa, Misato Hayashi, Anne Burrows, Jordan Pater, Takako Miyabe-Nishiwaki, Jack L. Richardson, Martha M. Robbins, Bridget Waller, Katja Liebal. "GorillaFACS: The Facial Action Coding System for the Gorilla spp.." PLoS ONE, 2025. doi:10.1371/journal.pone.0308790