1. Equilibrium, scale and inheritance in geomorphology;Ahnert;Geomorphology,1994
2. Biris, I.A., Veen, P., 2005. Sustainable Management and Protection of Virgin Forests in Romania. European Nature Conference “Our landscapes: space for nature opportunities for people”. Natuurmonumenten ECNC Europarc Eurosite, Apeldoorn.
3. Measuring landscapes: a planner's handbook;Botequilha,2006
4. The last frontier forests: ecosystems and economies on the edge;Bryant,1997
5. The value of the world's ecosystem services and natural capital;Costanza;Nature,1997