1. Aczél, J.,Einige aus Funktionalgleichungen zweier Veränderlichen ableitbare Differentialgeichungen. Acta Sci. Math. (Szeged)13 (1949), 179–189.
2. Aczél, J.,Remarks on a problem of Gy. Targonski. Report of the 27th ISFE, Poland 1989. Aequationes Math.39 (1990), 314–315.
3. Aczél, J. andGronau, D.,Some differential equations related to iteration theory. Canad. J. Math.40 (1988), 695–717.
4. Grazer Math. Bericht;J. Aczél,1988
5. Agnes, C. andRasetti, M.,Complexity, undecidability and chaos: a class of dynamical systems with fractal orbits. In: Livi et al. (eds),Workshop on chaos and complexity, Torino, Oct. 5–11, 1987. World Scientific, Singapore, 1988, pp. 3–25.