Authors
Elena Tsvetkova
Department of Ecology, Protection and Remediation of the Environment, Faculty of Ecology and Landscape Architecture, University of Forestry, Sofia, Bulgaria
Galin Milchev
Department of Mathematics, Physics and Informatics, Faculty of Forest Industry, University of Forestry, Sofia, Bulgaria
Hristina Stefanova
Department of Ecology, Protection and Remediation of the Environment, Faculty of Ecology and Landscape Architecture, University of Forestry, Sofia, Bulgaria
Rumen Tomov
Department of Plant Protection, Faculty of Agronomy, University of Forestry, Sofia, Bulgaria