@article{IM2_1996_60_1_a3,
     author = {W. V. Zudilin},
     title = {On a~measure of irrationality for values of $G$-functions},
     journal = {Izvestiya. Mathematics},
     pages = {91--118},
     year = {1996},
     volume = {60},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1996_60_1_a3/}
}