Kasprzak, Agata, Jacek Motyka, and Marta Wardas-Lasoń. 2013. “Changes in the Chemical Composition of Groundwater in Quaternary Aquifer in Old Krakow, Poland (years 2002-2012)”. Geology, Geophysics and Environment 39 (2):143. https://doi.org/10.7494/geol.2013.39.2.143.