@article{SM_1996_187_3_a5,
     author = {Sh. T. Tetunashvili},
     title = {Trigonometric, {Walsh,} and {Haar} null-series},
     journal = {Sbornik. Mathematics},
     pages = {413--450},
     year = {1996},
     volume = {187},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1996_187_3_a5/}
}