1. Some general methods in the theory of functional equations in one variable. New applications of functional equations;Aczél;Uspehi Mat. Nauk (N.S.),1956
2. J. Aczél, E. F. Beckenbach, 1980, On Hölder's inequality, General Inequalities 2, 145, 150, Birkhäuser Verlag, Basel
3. Bemerkung zur Cayley-Kleinschen Massbestimmung;Aczél;Publ. Math. (Debrecen),1955
4. On an inequality concerning an indefinite form;Bellman;Am. Math. Monthly,1957
5. Inequalities;Beckenbach,1961