@article{10_4064_cm122_2_14,
     author = {Janusz Matkowski},
     title = {A functional equation related to an equality of means problem},
     journal = {Colloquium Mathematicum},
     pages = {289--298},
     publisher = {mathdoc},
     volume = {122},
     number = {2},
     year = {2011},
     doi = {10.4064/cm122-2-14},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm122-2-14/}
}