@article{IM2_1971_5_5_a1,
     author = {N. I. Fel'dman},
     title = {An effective refinement of the exponent in {Liouville's} theorem},
     journal = {Izvestiya. Mathematics},
     pages = {985--1002},
     year = {1971},
     volume = {5},
     number = {5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1971_5_5_a1/}
}