An Inequality for a Family of Means. - Heinz-Jürgen Seiffert (SIAM Rev., 1991)

Symmetric Inequalities for xx and xx2 : 10766. - Szilárd András; Ronald A. Kopas; Heinz-Jürgen Seiffert (Am. Math. Mon., 2000)

Partitions and Pentagonal Numbers: 10628. - George E. Andrews; Kee-Wai Lau; G. L. Body; David Callan; Robin J. Chapman; G. Lord; Heinz-Jürgen Seiffert; Doron Zeilberger (Am. Math. Mon., 2000)

The Variance of Logarithms: 10690. - Robert Helmbold; Wook Kim; Robert A. Agnew; Zafar Ahmed; Saïd Amghibech; Kenneth F. Andersen; P. J. Anderson; G. Bower; Bruce S. Burdick; Robin J. Chapman; Daniele Donini; Patrick J. Fitzsimmons; et al. (Am. Math. Mon., 2000)

A Cute Characterization of Acute Triangles: 10713. - Juan-Bosco Romero Márquez; Heinz-Jürgen Seiffert (Am. Math. Mon., 2000)

Two Sums That Are Congruent Modulo p: 10723. - Christopher J. Hillar; Heinz-Jürgen Seiffert (Am. Math. Mon., 2001)

Problem 11172. - Heinz-Jürgen Seiffert (Am. Math. Mon., 2005)

More A-G Inequalities: 11211. - Mihály Bencze; Heinz-Jürgen Seiffert (Am. Math. Mon., 2007)

An Integral Inequality: 11133. - Paul Bracken; Heinz-Jürgen Seiffert (Am. Math. Mon., 2007)

Familiar Identities in Disguise: 11172. - Heinz-Jürgen Seiffert (Am. Math. Mon., 2007)