1. Understanding the Organization of Industrial Ecosystems
2. Ashton, W. S., Firman, J. and Hall, K. Industrial symbiosis in the Barceloneta pharmaceutical cluster. Research Paper for the Spring 2002 Industrial Ecology Course. New Haven, CT: Yale School of Forestry & Environmental Studies.
3. An industrial ecology project in practice: exploring the boundaries of decision-making levels in regional industrial systems
4. Botero, L., Fujita, C. and Henry, T. 2004. “The potential for industrial symbiosis in La Montaña and San Antonio industrial parks of Aguadilla, Puerto Rico”. New Haven, CT: Yale School of Forestry & Environmental Studies. Research paper for the Industrial Ecology Spring 2004 Course