@article{SM_1985_52_2_a15,
     author = {A. A. Pekarskii},
     title = {Inequalities of {Bernstein} type for derivatives of rational functions, and inverse theorems of rational approximation},
     journal = {Sbornik. Mathematics},
     pages = {557--574},
     publisher = {mathdoc},
     volume = {52},
     number = {2},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1985_52_2_a15/}
}