@article{100423, author = {I. Singer}, title = {On a theorem of V. Pt\'ak concerning best approximation of continuous functions in the metric $\int\_a^b|x(t)|dt$}, journal = {Czechoslovak Mathematical Journal}, volume = {10}, year = {1960}, pages = {425-431}, zbl = {0099.28202}, mrnumber = {0121630}, language = {en}, url = {http://dml.mathdoc.fr/item/100423} }
Singer, I. On a theorem of V. Pták concerning best approximation of continuous functions in the metric $\int_a^b|x(t)|dt$. Czechoslovak Mathematical Journal, Tome 10 (1960) pp. 425-431. http://gdmltest.u-ga.fr/item/100423/
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