Olsen, A.-M. ., Kristensen, H. G. ., Iversen, K. W. ., Pedersen, N. H. ., Pertoldi, C. ., Alstrup, A. K. O. ., Jensen, T. H. ., & Pagh, S. . (2020). Assessment of Abnormal Behaviour and the Effect of Enrichment on Captive Chimpanzees in Aalborg Zoo. Genetics & Biodiversity Journal, 4(2), 73–91. https://doi.org/10.46325/gabj.v4i2.99