| Nonsmooth analysis | 
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| [Hiriart-Urruty and Lemaréchal, 2001]   | J.-B. Hiriart-Urruty and C. Lemaréchal (2001). Fundamentals of Convex Analysis. Springer Verlag, Heidelberg. | 
| [Lemaréchal and Oustry, 2001]   | C. Lemaréchal and F. Oustry (2001). Growth conditions and $\cal U$-Lagrangians. In: Set-Valued Analysis, 9(1/2):123--129. | 
| [Lemaréchal et al., 2000]   | C. Lemaréchal and F. Oustry and C. Sagastizábal (2000). The $\cal U$-Lagrangian of a convex function. In: Transactions of the AMS, 352(2):711--729. | 
| [Lemaréchal and Sagastizábal, 1996]   | C. Lemaréchal and C. Sagastizábal (1996). More than first-order developments of convex functions_ primal-dual relations. In: Journal of Convex Analysis, 3(2):1--14. |