Cretaceous. Natl. Geogr. Res. 7: 68 87. Weishampel, D. B. 1991. A theoretical morphologic approach to tooth replacement in lower vertebrates. In: Vogel, K. & Schmidt Kittler, N. (eds.). Constructional Morphology and Biomechanics: Concepts and Implications. Springer Verlag, Berlin. pp. 295 310. External links David B. Weishampel - The Center for Functional Anatomy and Evolution at JHU (Archived) 1952 births Living people University of Pennsylvania alumni Johns Hopkins University faculty American paleontologists