1. Advanced Problem 4867;Fan;American Mathematical Monthly,1959
2. An Integral Inequality: Problem 4867;Fan;American Mathematical Monthly,1960
3. Inequalities;Beckenbach,1961
4. On an inequality of Ky Fan;Alzer;Journal of Mathematical Analysis and Applications,1989
5. A short proof of Ky Fan’s inequality;Alzer;Archiv der Mathematik,1991