1. Kátai, I.: A remark on additive arithmetical functions. Ann. Univ. Sci. Budapest. Eötvös Sect. Math., 10, 81–83 (1967)
2. Kátai, I.: On a problem of P. Erdős. J. Number Theory, 2, 1–6 (1970)
3. Wirsing, E.: Characterisation of the logarithm as an additive function. 1969 Number Theory Institute. In: Proc. Sympos. Pure Math., Vol. XX, State Univ. New York, Stony Brook, N. Y., 1969; Amer. Math. Soc., Providence, RI, 1971, 375–381
4. Hildebrand, A.: An Erdős-Wintner theorem for differences of additive functions. Trans. Amer. Math. Soc., 310, 257–276 (1988)
5. Kochanek, T.: Stability aspects of arithmetic functions. Acta Arith., 132, 87–98 (2008)