1. Baron, K.: On the continuous solutions of a non-linear functional equation of the first order. Ann. Polon. Math. 28, 201–205 (1973)
2. Baron, K.: Functional equations of infinite order, Prace Naukowe Uniwersytetu Śląskiego w Katowicach 265, Uniwersytet Śląski, Katowice (1978)
3. Baron, K.: On the convergence of sequences of iterates of random-valued functions. Aequ. Math. 32, 240–251 (1987)
4. Baron, K.: Recent Results in a Theory of Functional Equations in a Single Variable, Series Mathematicae Catoviciensis et Debreceniensis (Seminar LV), vol. 15
http://www.math.us.edu.pl/smdk/papers2.html
(2003)
5. Baron, K.: Linear iterative equations of higher orders and random-valued functions. Publ. Math. Debr. 75, 1–9 (2009)