Schaefer, N. O., 
Schaefer, T., 
Bell, G. L., and 
Schumacher, B. A. 
               1995. 
A specimen of Plioplatecarpus from the Upper Cretaceous Pierre Shale, Cedar Creek Anticline, southwestern North Dakota. 
Proceedings of the North Dakota Academy of Science, 
49:
59. (While not an author on this contribution, Dean was responsible for training the two primary authors).
Google Scholar