Project 845: C. D. Shelton, P. M. Sander, K. Stein, H. Winkelhorst. 2013. Long bone histology indicates sympatric species of Dimetrodon (Lower Permian, Sphenacodontidae). Earth and Environmental Science Transactions of the Royal Society of Edinburgh. 103 (3-4):217-236.
This project has 13 specimens.