@article{10_14708_cm_v48i2_5271,
     author = {W{\l}odzimierz {\L}enski and Bogdan Szal},
     title = {Pointwise strong and very strong approximation by matrix means of {Fourier} series},
     journal = {Commentationes Mathematicae},
     pages = { 177--198},
     publisher = {mathdoc},
     volume = {48},
     number = {2},
     year = {2008},
     doi = {10.14708/cm.v48i2.5271},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v48i2.5271/}
}