1. Agostinelli C, Lund U (2013) R package circular: circular statistics (version 0.4-7). https://r-forge.r-project.org/projects/circular/
2. Barlow J, Boveng P (1991) Modeling age-specific mortality for marine mammal populations. Mar Mamm Sci 7(1):50–65
3. Benirschke K (1984) The frozen zoo concept. Zoo Biol 3(4):325–328
4. Blomqvist L (2004) International pedigree book for snow leopards (Uncia uncia) dataset. Technical report, Helsinki Zoo, Helsinki. Updated to 31 Dec 2003
5. Bradley AJ (2003) Stress, hormones and mortality in small carnivorous marsupials. In: Jones ME, Dickman CR, Archer M (eds) Predators with pouches: the biology of carnivorous marsupials. CSIRO Publishing, Collingwoord, Victoria, pp 254–267