1. G.W. SNEDECOR and W.G. COCHRAN, Statistical Methods, 8th ed., Iowa State University Press, Ames (1989).
2. N.R. DRAPER and H. SMITH, Applied Regression Analysis, 2nd ed, John Wiley, New York (1981).
3. J.H. ZAR, Biostatistical Analysis, Prentice-Hall, Englewood Cliffs (1974).
4. TALLARIDA, R.J. and R.B. MURRAY, Manual of Pharmacologic Calculations with Computer Programs, 2nd ed., Springer-Verlag, N.Y. (1987).