1. Catastrophe Theory: a contribution to the study of urban systems?;Amson;Environment and Planning B,1975
2. Two applications of catastrophe theory in transportation planning and urban economics;Dendrinos,1976
3. Facility size versus distance travelled: urban services and the fold catastrophe;Poston;Environment and Planning A,1977
4. Structural Stability and Morphogenesis;Thom,1976