1. Andrews, W.J., 1994. Nitrate in ground water and spring water near four dairy farms in north Florida, U.S. Geological Survey, 63 pp.
2. Carbon dioxide in the atmosphere of the unsaturated zone: an important control of groundwater hardness in limestones;Atkinson;J. Hydrol.,1977
3. Diffuse flow and conduit flow in limestone terrain in the Mendip Hills, Somerset (Great Britain);Atkinson;J. Hydrol.,1977
4. Ground water monitoring considerations in karst on young limestones;Beck,1986
5. The Global Water Cycle Geochemistry and Environment;Berner,1987