@article{MM2_1986__54_155122,
     author = {Wolfgang Sander},
     title = {On a {Functional} {Equation} {Arising} in {Information} {Theory.}},
     journal = {Manuscripta mathematica},
     pages = {439--452},
     publisher = {mathdoc},
     volume = {54},
     year = {1986},
     zbl = {0588.39006},
     url = {http://geodesic.mathdoc.fr/item/MM2_1986__54_155122/}
}