@article{PIM_1964_N_S_04_18_a2,
     author = {Fikret Vajzovi\'c},
     title = {On {The} {Functional} {Equation:} {T1(t+s)} {T2(t-s)} = {T3(t)} {T4(s)}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {21 },
     publisher = {mathdoc},
     volume = {_N_S_04},
     number = {18},
     year = {1964},
     url = {http://geodesic.mathdoc.fr/item/PIM_1964_N_S_04_18_a2/}
}