Bielak, S., Pijar, K., Staszkiewicz, K. (2012). Application of macrophytes in assessment and classification of ecological state of upland rivers and streams in south Poland, in accordance with requirements of the Water Framework Directive. Czasopismo Techniczne, 2012, 17-32. doi: https://doi.org/10.4467/2353737XCT.14.049.1826