@article{CM_1969__21_4_400_0, author = {Nitsche, J.}, title = {Umkehrs\"atze f\"ur Spline-Approximationen}, journal = {Compositio Mathematica}, volume = {21}, year = {1969}, pages = {400-416}, mrnumber = {259436}, zbl = {0199.39302}, language = {de}, url = {http://dml.mathdoc.fr/item/CM_1969__21_4_400_0} }
Nitsche, J. Umkehrsätze für Spline-Approximationen. Compositio Mathematica, Tome 21 (1969) pp. 400-416. http://gdmltest.u-ga.fr/item/CM_1969__21_4_400_0/
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