The Hahn–Banach Theorems. Introduction to the Theory of Conjugate Convex Functions

Brezis, H. (2011). The Hahn–Banach Theorems. Introduction to the Theory of Conjugate Convex Functions. In Functional Analysis, Sobolev Spaces and Partial Differential Equations (pp. 1–29). Springer New York. https://doi.org/10.1007/978-0-387-70914-7_1