@article{IM2_2013_77_1_a2,
     author = {P. Yu. Kozlov},
     title = {On the algebraic independence of functions of a~certain class},
     journal = {Izvestiya. Mathematics},
     pages = {20--29},
     year = {2013},
     volume = {77},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2013_77_1_a2/}
}