@article{IM2_1999_63_1_a1,
     author = {G. G. Gevorkyan and K. A. Navasardyan},
     title = {On {Walsh} series with monotone coefficients},
     journal = {Izvestiya. Mathematics},
     pages = {37--55},
     year = {1999},
     volume = {63},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1999_63_1_a1/}
}