1. Bermerkung zur Cauchy-Kleinschen Maβbestimmung;Aczél;Publ. Math.,1955
2. Inequalities;Beckenbach,1965
3. Some aspects of the theory of dynamic programming;Bellman;Scripta Mathematica,1955
4. On an inequality concerning an indefinite form;Bellman;Amer. Math. Monthly,1956
5. Dynamic Programming;Bellman,1957