@article{10_4064_ap_41_3_229_236,
     author = {Roman W\k{e}grzyk},
     title = {On the extension of integrable solutions of a functional equation of n-th order},
     journal = {Annales Polonici Mathematici},
     pages = {229--236},
     publisher = {mathdoc},
     volume = {41},
     number = {3},
     year = {1983},
     doi = {10.4064/ap-41-3-229-236},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-41-3-229-236/}
}