1. A. H. Neims and R. W. Borstel. in “Nutrition and the Brain,” ed. by R. J. Wurtman and J. J. Wurtman, Raven Press, New York, 1983, pp. 1–30.
2. G. W. Snedecor and W. G. Cochran, in “Statistical Methods,” 6th Ed., The Iowa State University Press, Ames, IA, U.S.A., 1967, pp. 135–171.