Autor:	Pojeta,, John, Wolberg, Donald L., Hoover, Peter R., Powell, Jean, Hoare, Richard D., Cowen, Richard, Signor, Philip W., Broadhead, Thomas W., Walker, Kenneth R., Langenheim,, Ralph L., Durham, J. Wyatt, Gil, April Vancamp, Flower, Margaret, Valentine, James W., Jablonski, David, Kennedy, W. J.
Zdroj:	Journal of Paleontology, 1989 Sep 01. 63(5), 714-728.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/1305637 Zobrazit plný text záznamu