1. Ash, R.A.: Real analysis and probability. New York: Academic Press 1972
2. Berge, C.: Topological spaces. New York: MacMillan 1963
3. Himmelberg, C.J.: Measurable relations. Fundam, Math.LXXXVII, 53–72 (1975)
4. Himmelberg, C.J., Parthasarathy, T., VanVleck, F.S.: Optimal plans for dynamic programming problems. Math. Operat. Res.1, 390–394 (1976)
5. Holmstrom, B.: On the theory of delegation. In: Boyer, M., Kihlstrom, R. (eds.) Bayesian models in economic theory. Amsterdam: North Holland 1984