Połeć, M., Aleksander-Kwaterczak, U., Wątor, K., & Kmiecik, E. (2018). The occurrence of microplastics in freshwater systems – preliminary results from Krakow (Poland). Geology, Geophysics and Environment, 44(4), 391. https://doi.org/10.7494/geol.2018.44.4.391