@article{AM2_1977__15_136655,
     author = {R. Goldstein},
     title = {On meromorphic solutions of a functional equation.},
     journal = {Aequationes mathematicae},
     pages = {239--248},
     publisher = {mathdoc},
     volume = {15},
     year = {1977},
     zbl = {0357.30006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1977__15_136655/}
}