Bakker, R. T. and Galton, P. M. (1974) Dinosaur monophyly and a new class of vertebrates. Nature 248: 168-172.
De la Beche, H. T. and Conybeare, W. D. (1821) Notice of the discovery of a new fossil animal, forming a link between the Ichthyosaurus and the crocodile, together with general remarks on the osteology of Ichthyosaurus. Trans. Geol. Soc. London 5: 559-594.
Gauthier, J. (1986) Saurischian monophyly and the origin of birds. Mem. Calif. Acad. Sci. 8: 1-55.