Holmberg, J., K.-H. Robèrt. And K.-E. Eriksson. 1996. "Socio-Ecological Principles for Sustainability." in R. Costanza, S. Olman, and J. Martinez-Alier, editors. Getting Down to Earth - Practical Applications of Ecological Economics. Washington D.C.: Island Press.
 View Details / Order

Robèrt, K.-H. Summer 2000. "Reflections on System Condition Four through My Experience at Davos." The Natural Step Newsletter, 1(12).
 View PDF