@article{PIM_1997_N_S_62_76_a6,
     author = {C.-S. Lin and Y.J. Cho},
     title = {Additive f-bimorphisms and {Cosine} {Type} {Equations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {63 },
     publisher = {mathdoc},
     volume = {_N_S_62},
     number = {76},
     year = {1997},
     zbl = {0994.39019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1997_N_S_62_76_a6/}
}