1. Alicante Declaration (2006) The action agenda that resulted from the International Symposium on Groundwater Sustainability (ISGWAS) held in Alicante, Spain, on January 23–27, 2006. http://www.worldwatercouncil.org/fileadmin/wwc/World_Water_Forum/WWF4/declarations/Alicante_Declaration.doc. Accessed on 29 June 2018
2. Benischke R (2018) Karst water resources of Austria, hydrogeological aspects and problems. In: Proceedings of the conf. “Karst 2018 Expect the Unexpected”, 6–9 June 2018, Trebinje, pp 23–29
3. Burke JJ, Moench HM (2000) Groundwater and society: resources, tensions and opportunities, Spec. ed. of DESA and ISET, UN public. st/esa/265, New York, pp 1–170
4. Chen Z, Auler AS, Bakalowicz M, Drew D, Griger F, Hartmann J, Jiang G, Moosdorf N, Richts A, Stevanović Z, Veni G, Goldscheider N (2017) The world karst aquifer mapping project – concept, mapping procedure and map of Europe. Hydrogeol J 25(3):771–785
5. COST 65 (Cooperation in Science and Technology) (1995) Hydrogeological aspects of groundwater protection in karstic areas, final report (COST action 65), Brussels, Luxemburg