@article{SM_1985_52_2_a8,
     author = {V. M. Millionshchikov},
     title = {On indices of exponential separation},
     journal = {Sbornik. Mathematics},
     pages = {439--470},
     publisher = {mathdoc},
     volume = {52},
     number = {2},
     year = {1985},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1985_52_2_a8/}
}