@article{M2AN_1981__15_3_231_0, author = {Helfrich, Hans-Peter}, title = {Simultaneous approximation in negative norms of arbitrary order}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique}, volume = {15}, year = {1981}, pages = {231-235}, mrnumber = {631677}, zbl = {0495.41010}, language = {en}, url = {http://dml.mathdoc.fr/item/M2AN_1981__15_3_231_0} }
Helfrich, Hans-Peter. Simultaneous approximation in negative norms of arbitrary order. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 15 (1981) pp. 231-235. http://gdmltest.u-ga.fr/item/M2AN_1981__15_3_231_0/
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