@article{CM_1969__21_4_400_0,
author = {Nitsche, J.},
title = {Umkehrs\"atze f\"ur {Spline-Approximationen}},
journal = {Compositio Mathematica},
pages = {400--416},
year = {1969},
publisher = {Wolters-Noordhoff Publishing},
volume = {21},
number = {4},
mrnumber = {259436},
zbl = {0199.39302},
language = {de},
url = {https://www.numdam.org/item/CM_1969__21_4_400_0/}
}
Nitsche, J. Umkehrsätze für Spline-Approximationen. Compositio Mathematica, Tome 21 (1969) no. 4, pp. 400-416. https://www.numdam.org/item/CM_1969__21_4_400_0/
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