Kotowski, Tomasz, and Stefan Satora. “Isotope Characterisation of Deep Aquifers in the Gwda Catchment, Northern Poland”. Geologos 22, no. 2 (September 20, 2016): 137–147. Accessed May 7, 2024. https://pressto.amu.edu.pl/index.php/logos/article/view/logos-2016-0014.