@article{RM_2013_68_6_a4,
     author = {W. Zudilin},
     title = {On the irrationality measure of $\pi^2$},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1133--1135},
     publisher = {mathdoc},
     volume = {68},
     number = {6},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2013_68_6_a4/}
}