@article{10_14708_cm_v27i1_6195,
     author = {H. Musielak},
     title = {Jackson type inequalities for averaged moduli of smoothness},
     journal = {Commentationes Mathematicae},
     pages = { 143--158},
     year = {1987},
     volume = {27},
     number = {1},
     doi = {10.14708/cm.v27i1.6195},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v27i1.6195/}
}