[1] I. Babuška:
Über universal optimale Quadraturformeln. Teil 1, Apl. mat. 13 (1968), 304-338, Teil 2, ApI. mat. 13 (1968), 388-404.
MR 0244680
[3] F.-J. Delvos:
Interpolation of odd periodic functions on uniform meshes. ISNM 74 (1985), 105-121..
MR 0899092 |
Zbl 0578.41012
[6] M. Práger:
Universally optimal approximation of functionals. Apl. mat. 24 (1979), 406-420.
MR 0547044