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Rätz, Jürg (2013). On the functional equation x + f(y + f(x))=y + f(x + f(y)). Aequationes mathematicae, 86(1-2), pp. 187-200. Springer 10.1007/s00010-013-0188-8
Rätz, Jürg (2005). On a functional equation related to projections of abelian groups. Aequationes mathematicae, 70(3), pp. 279-297. Birkhäuser 10.1007/s00010-005-2811-9
Rätz, Jürg (2003). On inequalities associated with the Jordan-von Neumann functional equation. Aequationes mathematicae, 66(1-2), pp. 191-200. Birkhäuser 10.1007/s00010-003-2684-8
