1. Brahim, Y.A., Benkaddour, A., Agoussine, M., Lemkademe, A.A., Al Yacoubi, L., and Bouchaou, L., Origin and salinity of groundwater from interpretation of analysis data in the mining area of Oumjrane, Southeastern Morocco, Environ. Earth Sci., 2015, vol. 74, pp. 4787–4802.
2. Cheong, J.Y., Hamm, S.Y., Lee, J.H., Lee, K.S., and Woo, N.C., Groundwater nitrate contamination and risk assessment in an agricultural area, South Korea, Environ. Earth Sci., 2012, vol. 66, pp. 1127–1136.
3. Craig, H., Isotopic variations in meteoric waters, Science, 1961, vol. 133, pp. 1702–1703.
4. Fernandez-Chacon, F., Benavente, J., Rubio-Campos, J.C., Kohfahl, C., Jimenez, J., Meyer, H., Hubberten, H., and Pekdeger, A., Isotopic composition (δ18O and δD) of precipitation and groundwater in a semi-arid, mountainous area (Guadiana Menor basin, Southeast Spain), Hydrol. Processes:
An Int. J., 2010, vol. 24, pp. 1343–1356.
5. Freeze, R. and Cherry, J., Groundwater, New Jersey: Prentice-Hall, Englewood Cliffs, 1979.