@article{VMUMM_2013_5_a3,
     author = {A. A. Polyanskii},
     title = {Quadratic irrationality exponents of certain numbers},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {25--29},
     publisher = {mathdoc},
     number = {5},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_2013_5_a3/}
}