CERRONE, M. Keepers as social companions: Tactile communication and social enrichment for captive apes. Sign Systems Studies, [S. l.], v. 47, n. 3/4, p. 453–479, 2019. DOI: 10.12697/SSS.2019.47.3-4.06. Disponível em: https://ojs.utlib.ee/index.php/sss/article/view/SSS.2019.47.3-4.06. Acesso em: 19 apr. 2024.