@article{MZM_1980_27_5_a2,
     author = {A. Yu. Petrovich},
     title = {Representation of monotonic functions by trigonometric series},
     journal = {Matemati\v{c}eskie zametki},
     pages = {691--699},
     year = {1980},
     volume = {27},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1980_27_5_a2/}
}