1. Univerzitet “Sv. Kiril i Metodij”; Faculty of Forestry; bul. Aleksandar Makedonski bb 1000 Skopje Macedonia
2. Faculty of Forestry; Department of Forestry; University of Forestry; Sofia Bulgaria
3. WSL Swiss Federal Research Institute; Birmensdorf Switzerland
4. Department of Plant Pathology and Plant-Microbe Biology; Cornell University; Ithaca NY USA