@article{10_4064_aa99_4_6,
     author = {Masaaki Amou and Masanori Katsurada and Keijo V\"a\"an\"anen},
     title = {Arithmetical properties of the values of
functions satisfying certain functional
equations of {Poincar\'e}},
     journal = {Acta Arithmetica},
     pages = {389--407},
     publisher = {mathdoc},
     volume = {99},
     number = {4},
     year = {2001},
     doi = {10.4064/aa99-4-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa99-4-6/}
}