Enquist, Brian J., Bruce H. Tiffney, and Karl J. Niklas. "Metabolic Scaling and the Evolutionary Dynamics of Plant Size, Form, and Diversity: Toward a Synthesis of Ecology, Evolution, and Paleontology." International Journal of Plant Sciences 168/5 (2007): 729-749.

Enquist, Brian J., Bruce H. Tiffney, and Karl J. Niklas. "Metabolic Scaling and the Evolutionary Dynamics of Plant Size, Form, and Diversity: Toward a Synthesis of Ecology, Evolution, and Paleontology." International Journal of Plant Sciences 168/5 (2007): 729-749.