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