@article{AM2_1983__26_136997, author = {L. Sz\'ekelyhidi}, title = {Almost periodicity and functional equations.}, journal = {Aequationes mathematicae}, pages = {163--175}, publisher = {mathdoc}, volume = {26}, year = {1983}, zbl = {0566.39010}, url = {http://geodesic.mathdoc.fr/item/AM2_1983__26_136997/} }