Mbao, V.; Berkvens, Dirk; Dorny, P.; Van den Bossche, Peter; Marcotty, Tanguy(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2007-03)
Makungu, Modesta; Du Plessis, Wencke M.; Barrows, Michelle; Koeppel, Katja Natalie; Groenewald, Hermanus B.(American Association of Zoo Veterians, 2012)