@article{10_21136_CMJ_1960_100423,
     author = {Singer, Ivan},
     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},
     pages = {425--431},
     publisher = {mathdoc},
     volume = {10},
     number = {3},
     year = {1960},
     doi = {10.21136/CMJ.1960.100423},
     mrnumber = {0121630},
     zbl = {0099.28202},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1960.100423/}
}