@article{10_4064_cm_55_2_261_265,
     author = {Janusz Wysocza\'nski},
     title = {Characterization of amenable groups and the {Littlewood} functions on free groups},
     journal = {Colloquium Mathematicum},
     pages = {261--265},
     publisher = {mathdoc},
     volume = {55},
     number = {2},
     year = {1987},
     doi = {10.4064/cm-55-2-261-265},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-55-2-261-265/}
}