@article{AM2_1987__32_137186,
     author = {Maciej Sablik},
     title = {Generating solutions of some {Cauchy} and cosine functional equations.},
     journal = {Aequationes mathematicae},
     pages = {216--226},
     publisher = {mathdoc},
     volume = {32},
     year = {1987},
     zbl = {0619.39011},
     url = {http://geodesic.mathdoc.fr/item/AM2_1987__32_137186/}
}