1. Asch, S. E.: Studies of independence and conformity: I. A minority of one against a unanimous majority. Psychol. Monogr.,70, Whole No. 416, 1956.
2. Atkinson, R. C., G. H. Bower andE. J. Crothers: An introduction to mathematical learning theory. New York: Wiley, 1965.
3. Atkinson, R. C. andW. K. Estes: Stimulus Sampling Theory. In: Handbook of Mathematical Psychology Vol. II (R. D. Luce, R. R. Bush and E. Galanter, eds.), 121–268, 1963.
4. Bush, R. R. andF. Mosteller: Stochastic Models for Learning. New York: Wiley, 1955.
5. Cox, D. R. andH. D. Miller: The theory of stochastic processes, London: Methuen, 1965.