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On the bifurcation of species
Chaos: An Interdisciplinary Journal of Nonlinear Science 18(4):043114 (2008)
Ecological polarities of mid-Cenozoic fossil plants and animals from central Oregon
Paleobiology 30(4):561 (2004)
The Evolution of Body Size in Extant Groups of North American Freshwater Fishes: Speciation, Size Distributions, and Cope’s Rule.
The American Naturalist 161(3):413-421 (2003)
Quo vadis eohippus? The systematics and taxonomy of the early Eocene equids (Perissodactyla)
Zoological Journal of the Linnean Society 134(2):141-256 (2002)
STRATOCLADISTIC ANALYSIS OF PALEOCENE CARPOLESTIDAE (MAMMALIA, PLESIADAPIFORMES) WITH DESCRIPTION OF A NEW LATE TIFFANIAN GENUS
Journal of Vertebrate Paleontology 21(1):119 (2001)