@article{10_4064_ap_19_3_257_269,
     author = {H. \'Swiatak},
     title = {Connections between symmetry or asymmetry of the equations $f_1(x_1+...+x_n) = \ensuremath{\sum}_{(i_1},...,i_n)} f(x_i_1)...f_n(x_i_n)$ and their solutions},
     journal = {Annales Polonici Mathematici},
     pages = {257--269},
     publisher = {mathdoc},
     volume = {19},
     number = {3},
     year = {1967},
     doi = {10.4064/ap-19-3-257-269},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-19-3-257-269/}
}