1. Abdul-Wahab, S. A.; Bakheit, C. S.; Al-Alawi, S. M., (2005). Principal component and multiple regression analysis in modelling of ground-level ozone and factors affecting its concentrations. Environ. Model. Softw., 20 (10), 1263–1271 (9 pages).
2. APHA, (1998). Standard methods for the examination of water and wastewater. American Public Health Association, 18th. Ed., Washington DC., USA.
3. Bengraine, K.; Marhaba, T. F., (2003). Using principal component analysis to monitor spatial and temporal changes in water quality. J. Hazard. Mater., 100 (1-3), 179–195 (17 pages).
4. Bricker, O. P.; Jones, B. F., (1995). Main factors affecting the composition of natural waters. In: Salbu, B., Steinnes, E. (Eds.), Trace Elements in Natural Waters. CRC Press, Boca Raton, FL, 1–5.
5. Clesceri, L. S.; Greenberg, A. E.; Eaton, A. D., (1998). Standard Methods for the Examination of Water and Wastewater, 20th. Ed., American Public Heath Association (APHA), American Water Works Association (AWWA) and Water Environment Federation (WEF), Washington, DC.