8.
Chen et al. 2017 – Chen, Z., Auler, A. S., Bakalowicz, M., Drew, D., Griger, F., Hartmann, J., Jiang, G., Moosdorf, N., Richts, A., Stevanovic, Z., Veni, G. and Goldscheider, N. 2017. The World Karst Aquifer Mapping Project: Concept, Mapping Procedure and Map of Europe. Hydrogeology Journal 25(3), pp. 771–785, DOI: 10.1007/s10040-016-1519-3.