@article{SM_2002_193_4_a1,
     author = {I. N. Brui},
     title = {Methods of summability of trigonometric series and function spaces},
     journal = {Sbornik. Mathematics},
     pages = {487--506},
     publisher = {mathdoc},
     volume = {193},
     number = {4},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2002_193_4_a1/}
}