@article{10_21136_CMJ_1958_100301,
     author = {Pt\'ak, Vlastimil},
     title = {On approximation of continuous functions in the metric $\int_a^b |x(t)| dt$},
     journal = {Czechoslovak Mathematical Journal},
     pages = {267--273},
     publisher = {mathdoc},
     volume = {08},
     number = {2},
     year = {1958},
     doi = {10.21136/CMJ.1958.100301},
     mrnumber = {0100752},
     zbl = {0082.27804},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1958.100301/}
}