1. The Knife River Flint Quarries: Excavations at Site 32DU508;Ahler,1986
2. Mass analysis of flaking debris: studying the forest rather than the tree;Ahler,1989
3. How Nature Works: The Science of Self-Organized Criticality;Bak,1996
4. Self-organized criticality;Bak;Physical Review A,1988
5. Fractal analysis of scaling and spatial clustering of fractures;Barton,1995