1. Faculty of Forestry University of Banja Luka Republic of Srpska Bosnia and Herzegovina
2. Research Centre of Natural Resources, Environment and Society (CERNAS) Polytechnic Institute of Coimbra Coimbra Portugal
3. Department of Ecology and Evolutionary Biology University of Colorado Boulder Colorado USA
4. Faculty of Science University of Banja Luka Republic of Srpska Bosnia and Herzegovina
5. Department for Soil Institute of Forestry Belgrade Serbia