On the continuous dependence of continuous solutions of a functional equation ofn-th order on given functions

Baron, K.,Continuous Solutions of a Functional Equation of n-th Order, Aequationes Math. 9, 257–259 (1973). Boyd, D. W. andWong, J. S. W.,On Nonlinear Contractions, Proc. Amer. Math. Soc.20, 458–564 (1969). Czerwik, S.,On the Continuous Dependence of Solutions of Some Functional Equations on Given Functions, Ann. Polon. Math.24, 247–252 (1971). Kordylewski, J. andKuczma, M.,On the Continuous Dependence of Solutions of Some Functional Equations on Given Functions (I), Ann. Polon. Math.10, 41–48 (1961). Kordylewski, J. andKuczma, M.,On the Continuous Dependence of Solutions of Some Functional Equations on Given Functions (II), Ann. Polon. Math.10, 167–174 (1961). Reich, S.,Kannan's Fixed Point Theorem, Boll. Un. Mat. Ital. (4)4, 1–11 (1971). Wong, Ch. S.,Subadditive Functions, Pacific J. Math.36, 549–551 (1971).