Authors: Van der Leeuw, AHJ Bout, RG Zweers, GA

Citation: Ahj. Van Der Leeuw et al., Evolutionary morphology of the neck system in Ratites, Fowl and Waterfowl, NETH J ZOOL, 51(2), 2001, pp. 243-262

Authors: Gussekloo, SWS Zweers, GA

Citation: Sws. Gussekloo et Ga. Zweers, The paleognathous Pterygoid-Palatinum complex. A true character?, NETH J ZOOL, 49(1), 1999, pp. 29-43