Econometrica: Jul 1972, Volume 40, Issue 4
Smooth Preferences
https://doi.org/0012-9682(197207)40:4<603:SP>2.0.CO;2-W
p.
603-615
Gerard Debreu
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https://doi.org/0012-9682(197207)40:4<603:SP>2.0.CO;2-W
p.
603-615
Gerard Debreu