1. Departamento Sistemas y Recursos Forestales — Deparment of Forest Systems and Resources, Centro de Investigación Forestal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria and Institute on Sustainable Forest Management. Ctra. A. Coruña, km 7,5 28040, Madrid, Spain.
2. Technical University of Lisbon, Instituto Superior de Agronomia. Centro de estudos Florestais, Tapada de Ajuda, 1349-017, Lisboa, Portugal.
3. Sustainable Forest Management Group, University of Valladolid and Institute on Sustainable Forest Management, Avda, Madrid, 44, 34004 Palencia, Spain.