@article{CMUC_2009__50_4_a7,
     author = {Szal, Bogdan},
     title = {Trigonometric approximation by {N\"orlund} type means in $L^p$-norm},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {575--589},
     publisher = {mathdoc},
     volume = {50},
     number = {4},
     year = {2009},
     mrnumber = {2583135},
     zbl = {1212.42002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_2009__50_4_a7/}
}