@article{GDZPPN002026252, title = {On a Functional Equation Related to Iteration.}, journal = {Aequationes mathematicae}, volume = {8}, year = {1972}, pages = {109-112}, zbl = {0256.39003}, url = {http://dml.mathdoc.fr/item/GDZPPN002026252} }
Lamperti, John; O'Brien, George. On a Functional Equation Related to Iteration.. Aequationes mathematicae, Tome 8 (1972) pp. 109-112. http://gdmltest.u-ga.fr/item/GDZPPN002026252/