@article{SM_1971_14_3_a7,
     author = {S. V. Bochkarev},
     title = {Absolute convergence of {Fourier} series over complete orthonormal systems of functions},
     journal = {Sbornik. Mathematics},
     pages = {429--437},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {1971},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1971_14_3_a7/}
}