@article{SM_2005_196_7_a2,
     author = {W. V. Zudilin},
     title = {Ramanujan-type formulae and irrationality measures of some multiples of~$\pi$},
     journal = {Sbornik. Mathematics},
     pages = {983--998},
     year = {2005},
     volume = {196},
     number = {7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2005_196_7_a2/}
}