@article{IVM_1998_4_a1,
     author = {V. \`E. Gheit},
     title = {The generalized {Lorentz} theorem on {Fourier} series with monotone coefficients and its converse},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {15--17},
     publisher = {mathdoc},
     number = {4},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1998_4_a1/}
}