1. E.W. Adams, R.F. Fagot and R. Robinson, On the empirical status of axioms in theories of fundamental measurement, Journal of Mathematical Psychology 7(1970)379.
2. G. Debreu, Topological methods in cardinal utility theory, in:Mathematical Methods in the Social Sciences, ed. K.J. Arrow, S. Karlin and P. Suppes (Stanford University Press, Stanford, 1960) pp. 16–26.
3. G. Debreu and T.C. Koopmans, Additively decomposed quasi-convex functions, Math. Progr. 24(1982)1.
4. W. Eichhorn,Functional Equations in Economics (Addison-Wesley, Reading, MA, 1978).
5. D.H. Krantz, R.D. Luce, P. Suppes and A. Tversky,Foundations of Measurement, Vol. I (Academic Press, New York, 1971).