@article{MZM_1987_42_6_a1,
     author = {V. I. Ivanov and S. A. Pichugov},
     title = {Approximation of periodic functions in $L_p$ by linear positive methods and multiple moduli of continuity},
     journal = {Matemati\v{c}eskie zametki},
     pages = {776--785},
     publisher = {mathdoc},
     volume = {42},
     number = {6},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_42_6_a1/}
}