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Schwarm, A; Clauss, Marcus; Ortmann, S; Alber, D; Flach, E J; Kühne, R; Tack, C; Hofer, H (2004). Energy and mineral nutrition in captive hippopotamidae. Proceedings of the European Association of Zoo and Wildlife Veterinarians, 5:315-316.
Clauss, Marcus; Schwarm, A; Ortmann, S; Alber, D; Flach, E J; Kühne, R; Hummel, J; Streich, W J; Hofer, H (2004). Intake, ingesta retention, particle size distribution and digestibility in the hippopotamidae. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 139(4):449-459.