Matthieu Dolbeault, David Krieg, Mario Ullrich, “A Sharp Upper Bound for Sampling Numbers in $L_2$”, SSRN Journal, 2022
Aicke Hinrichs, David Krieg, Erich Novak, Jan Vybíral, “Lower bounds for integration and recovery in L2”, Journal of Complexity, 72 (2022), 101662
V. K. Nguyen, V. D. Nguyen, “Best n-Term Approximation of Diagonal Operators and Application to Function Spaces with Mixed Smoothness”, Anal Math, 48:4 (2022), 1127