Abdelaati Daouia, Jean-Pierre Florens, and Léopold Simar, “Robust frontier estimation from noisy data: a Tikhonov regularization approach”, Econometrics and Statistics, vol. 14, April 2020, pp. 1–23.
Jean-Pierre Florens, Léopold Simar, and Ingrid Van Keilegom, “Estimation of the Boundary of a Variable Observed with A Symmetric Error”, Journal of the American Statistical Association, vol. 115, n. 529, March 2020, pp. 425–451.