An Unexpected Result in Classical Electrostatics (A. J. E. M. Janssen and J. B. M. Melissen). - P. C. Schuur; Rolf Richberg (SIAM Rev., 1993)

A Totient Sum: 10829. - Walther Janous; Rolf Richberg; Raul A. Simon (Am. Math. Mon., 2002)

A Moment Evaluation: 10919. - Michael Becker 007; Rolf Richberg (Am. Math. Mon., 2003)

Sum of a Series: 11131. - N. G. de Bruijn; Rolf Richberg (Am. Math. Mon., 2006)

A Completely Monotonic Function: 11140. - Walther Janous; Rolf Richberg (Am. Math. Mon., 2006)