@article{AM2_1978__18_136771,
     author = {R. Goldstein},
     title = {On meromorphic solutions of certain functional equations.},
     journal = {Aequationes mathematicae},
     pages = {112--157},
     publisher = {mathdoc},
     volume = {18},
     year = {1978},
     zbl = {0384.30009},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__18_136771/}
}