1. Cemagref, UR HYAX, 3275 Route de Cézanne – CS 40061, F-13182 Aix en Provence, France
2. Cemagref, UR HBAN, Parc de Tourvoie BP 44, 92163 Antony Cedex, France
3. Forest Research Centre, Technical University of Lisbon, Tapada da Ajuda, 1349-017 Lisboa, Portugal