@article{SM_2002_193_8_a2,
     author = {W. V. Zudilin},
     title = {On the irrationality measure for a~$q$-analogue of $\zeta(2)$},
     journal = {Sbornik. Mathematics},
     pages = {1151--1172},
     year = {2002},
     volume = {193},
     number = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2002_193_8_a2/}
}