1. Almost everywhere existence of the second differential of a convex function and some properties of convex surfaces connected with it;Alexandrov;Leningr. State Univ. Ann. Math. Ser.,1939
2. Über die Messbarkeit des Nutzens;Alt;Z. Natl.,1936
3. Representations of Preference Orderings;Bridges,1995
4. Preferences, Utility and Demand;Chipman,1971
5. Representation of a preference ordering by a numerical function;Debreu,1954