@article{PIM_1972_N_S_13_27_a9,
     author = {\v{Z}. Mijajlovi\'c},
     title = {On {The} {Functional} {Equation} f = fg},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {59 },
     publisher = {mathdoc},
     volume = {_N_S_13},
     number = {27},
     year = {1972},
     url = {http://geodesic.mathdoc.fr/item/PIM_1972_N_S_13_27_a9/}
}