@article{10_4064_ap_27_3_329_336,
     author = {C. T. Ng},
     title = {On the functional equation $f(x) + \ensuremath{\sum}_{i = 1}^n g_i(y_i) = h(T(x, y_1, y_2,...,y_n))$},
     journal = {Annales Polonici Mathematici},
     pages = {329--336},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {1972},
     doi = {10.4064/ap-27-3-329-336},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-27-3-329-336/}
}