Authors
Georgi Chernev
Department of Silicate Technology, University of Chemical Technology and Metallurgy, Sofia, Bulgaria
Nelly Christova
Institute of Microbiology “Stephan Angeloff”, Bulgarian Academy of Sciences, Sofia, Bulgaria
Lyudmila Kabaivanova
Institute of Microbiology “Stephan Angeloff”, Bulgarian Academy of Sciences, Sofia, Bulgaria
Lilyana Nacheva
Institute of Microbiology “Stephan Angeloff”, Bulgarian Academy of Sciences, Sofia, Bulgaria