1. Research Institute Pro Arbore, Gustav-Adolf-Str. 3, D-01219 Dresden , Germany
2. Research Institute for Forest Ecology and Forestry of Rhineland-Palatinate, Hauptstr. 16, D-67705 Trippstadt , Germany
3. Landesbetrieb Wald und Holz NRW (former LÖBF NRW, Forest Gene Bank, D-59821 Arnsberg ), Germany
4. Administration de la Nature et des Forêts, 16, Rue Eugene Ruppert, L-2453, Luxembourg , Luxembourg
5. Tharandt Botanic Garden and Arboretum, Pienner Str. 8, D-01737 Tharandt , Germany
6. FÖLV Biosphere Reserve ‘Mittelelbe’, Johannisstr. 18, D-06844 Dessau , Germany