@article{SM_2006_197_7_a4,
     author = {G. V. Radzievskii},
     title = {Direct and inverse theorems on approximation by root
},
     journal = {Sbornik. Mathematics},
     pages = {1037--1083},
     publisher = {mathdoc},
     volume = {197},
     number = {7},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_7_a4/}
}