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Polish Journal of Environmental Studies > 2010 > 19 > 2 > 449-452
Polish Journal of Environmental Studies > 2009 > 18 > 3 > 507-511
Polish Journal of Environmental Studies > 2007 > 16 > 3 > 385-388
Polish Journal of Environmental Studies > 2010 > 19 > 2 > 449-452
Polish Journal of Environmental Studies > 2009 > 18 > 3 > 507-511
Polish Journal of Environmental Studies > 2007 > 16 > 3 > 385-388