@article{MZM_1974_16_5_a1,
     author = {V. K. Dzyadyk},
     title = {On best approximation in classes of periodic functions defined by integrals of a~linear combination of absolutely monotonic kernels},
     journal = {Matemati\v{c}eskie zametki},
     pages = {691--701},
     publisher = {mathdoc},
     volume = {16},
     number = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_5_a1/}
}