- Correspondence to Professor Regina Grazuleviciene, Department of Environmental Sciences, Faculty of Natural Sciences, Vytauto Didžiojo universitetas, Str. Donelaicio 58, Kaunas 44248, Lithuania;
- Received August 2, 2012
- Revised January 14, 2013
- Accepted January 16, 2013
- First published February 12, 2013.
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