@article{10_21136_CMJ_1991_102491,
     author = {Nikodem, Kazimierz},
     title = {On $\varepsilon$-invariant measures and a functional equation},
     journal = {Czechoslovak Mathematical Journal},
     pages = {565--569},
     publisher = {mathdoc},
     volume = {41},
     number = {4},
     year = {1991},
     doi = {10.21136/CMJ.1991.102491},
     mrnumber = {1134949},
     zbl = {0761.28012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102491/}
}