1. Continuity and uniqueness in revealed preference;Chipman;J. Math. Econom.,1977
2. Theory of Ordinary Differential Equations;Coddington,1984
3. Representation of a preference ordering by a numerical function;Debreu,1954
4. Theory of Value, An Axiomatic Analysis of Economic Equilibrium;Debreu,1959
5. Smooth preferences;Debreu;Econometrica,1972