1. UR629; Écologie Forestière Méditerranéenne; INRA; Domaine Saint Paul Avignon F-84914 France
2. Scuola Superiore Sant'Anna; Piazza Martiri della Libertà 33 Pisa 56127 Italy
3. CNR; Institute of Bisciences and Bioresources; Via Madonna del Piano 10 Sesto Fiorentino (Firenze) 50019 Italy
4. CIFOR-INIA; Forest Research Centre; Carretera de La Coruña km 7.5 Madrid 28040 Spain