J. L. Craveiro and I. C. Almeida, "Natural heritage and urban growth: Ethics, Sustainability Education and Governance", in Sustainable Development and Planning IV - Ecology and the Environment, C.A. Brebbia, M. Neophytou, E. Beriatos, I. Ioannou & A.G. Kungolos, Ed., Wessex, Wessex Institute of Technology Press, 2008, vol. IV, pp. 193-201