マレク・クチマ
Kuczma, Marek (1968). Functional equations in a single variable. Warszawa: PWN
Kuczma, Marek; Choczewski, Bogdan; Ger, Roman (1990). Iterative functional equations. Cambridge: Cambridge University Press. ISBN 0-521-35561-3
Kuczma, Marek (2009). An introduction to the theory of functional equations and inequalities. Cauchy's equation and Jensen's inequality. Basel: Birkhäuser. ISBN 978-3764387495