1. Alekin, O.A. and Brazhnikova, L.V.: 1960, Contribution to the Knowledge of Dissolved Matter Runoff at the Earth Surface (in Russian),Gidrochim. Mater.,32, pp. 12?34.
2. Balazs, D.: 1977, The Geographical Distribution of Karst Area,Proc. 7th Int. Congress Speleology, Sheffield, pp. 13?15.
3. Baumgartner, A. and Reichel, E.: 1976,The World Water Balance, Elsevier, 179 pp.
4. Brinson, M.M.: 1976,Limnol. Oceano.,22, pp. 572?582.
5. Cadée, G.C.: 1984,Neth. J. Sea Res.,17, pp. 426?440.