@article{10_4064_cm131_2_4,
     author = {Sergi\u{i} Kolyada and Oleksandr Rybak},
     title = {On the {Lyapunov} numbers},
     journal = {Colloquium Mathematicum},
     pages = {209--218},
     publisher = {mathdoc},
     volume = {131},
     number = {2},
     year = {2013},
     doi = {10.4064/cm131-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm131-2-4/}
}