@article{SM_1980_37_1_a6,
     author = {E. M. Dyn'kin},
     title = {Free interpolation sets for {H\"older} classes},
     journal = {Sbornik. Mathematics},
     pages = {97--117},
     year = {1980},
     volume = {37},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1980_37_1_a6/}
}