![](http://www.rhinoresourcecenter.com/style_images/1/cat_arrow.gif) | Janis, C.M., 1989. A climatic explanation for patterns of evolutionary diversity in ungulate mammals. Palaeontology 32 (3): 463-481
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![](http://www.rhinoresourcecenter.com/style_images/1/cat_arrow.gif) | Janis, C.M., 1982. Evolution of horns in ungulates - ecology and palaeoecology. Biological Review (Cambridge Philosophical Society) 57 (2): 261-317
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![](http://www.rhinoresourcecenter.com/style_images/1/cat_arrow.gif) | Janis, C.M., 1982. Evolution of horns in ungulates - ecology and palaeoecology. Biological Review (Cambridge Philosophical Society) 57 (2): 261-317
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