1. Neuman E, Sándor J: On the Schwab-Borchardt mean. Math. Pannon. 2003, 14(2):253–266.
2. Seiffert H-J: Problem 887. Nieuw Arch. Wiskd. 1993, 11: 176.
3. Seiffert H-J: Aufgabe β 16. Die Wurzel 1995, 29: 221–222.
4. Chu Y-M, Qiu Y-F, Wang M-K: Sharp power mean bounds for combination of Seiffert and geometric means. Abstr. Appl. Anal. 2010., 2010: Article ID 108920
5. Chu Y-M, Qiu Y-F, Wang M-K, Wang G-D: The optimal convex combination bounds of arithmetic and harmonic means for the Seiffert’s means. J. Inequal. Appl. 2010., 2010: Article ID 436457