1. Box, G.E.P., Hunter, W.G., Hunter, J.S., 1978. Statistics for Experimenters. An Introduction to Design, Data Analysis and Model Building. John Wiley & Sons, Inc., New York.
2. Half-saturation constants for uptake of nitrate and ammonium by marine phytoplankton;Eppley;Limnology and Oceanography,1969
3. Esbensen, K., Schönkopf, S., Midtgaard, T., 1994. Multivariate Analysis in Practice. Wennberg Trykkeri AS, Trondheim.
4. Fisher, R.A., 1990. Statistical Methods, Experimental Design and Scientific Inference. (A re-issue of Statistical Methods for Research Workers (1925), the Design of Experiments (1935) and Statistical Methods and Scientific Inference (1956)). Bennett, J.H. (Ed.), Oxford University Press, Oxford.
5. Franson, M.A.H., Greenberg, A.E., Clesceri, L.S., Eaton, A.D., 1992. Standard Methods for the Examination of Water and Wastewater. American Public Health Association, Washington DC.