@article{CM_1969__21_4_400_0, author = {Nitsche, J.}, title = {Umkehrs\"atze f\"ur {Spline-Approximationen}}, journal = {Compositio Mathematica}, pages = {400--416}, publisher = {Wolters-Noordhoff Publishing}, volume = {21}, number = {4}, year = {1969}, mrnumber = {259436}, zbl = {0199.39302}, language = {de}, url = {http://archive.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. http://archive.numdam.org/item/CM_1969__21_4_400_0/
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