@article{10_4064_sm198_3_6,
     author = {Z. Ditzian},
     title = {Optimality of the range for which equivalence between
 certain measures of smoothness holds},
     journal = {Studia Mathematica},
     pages = {271--277},
     publisher = {mathdoc},
     volume = {198},
     number = {3},
     year = {2010},
     doi = {10.4064/sm198-3-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm198-3-6/}
}