@article{EMJ_2011_2_3_a6,
     author = {K. Runovski and H.-J. Schmeisser},
     title = {Methods of trigonometric approximation and generalized {smoothness.~I}},
     journal = {Eurasian mathematical journal},
     pages = {98--124},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EMJ_2011_2_3_a6/}
}