@article{IM2_1968_2_1_a1,
     author = {R. M. Trigub},
     title = {Linear summation methods and the absolute convergence of {Fourier} series},
     journal = {Izvestiya. Mathematics },
     pages = {21--46},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {1968},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1968_2_1_a1/}
}