@article{SM_2017_208_2_a3,
     author = {K. V. Runovski},
     title = {Trigonometric polynomial approximation, $K$-functionals and generalized moduli of smoothness},
     journal = {Sbornik. Mathematics},
     pages = {237--254},
     publisher = {mathdoc},
     volume = {208},
     number = {2},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2017_208_2_a3/}
}