Periodicity under Shift and Complement: 10823. - George E. Andrews; Karl David; S. J. Bernau; Marty Getz; Dixon Jones (Am. Math. Mon., 2002)

An Identity for Partitions of Integers: 10809. - David Beckwith; Karl David (Am. Math. Mon., 2002)

The Limit of a Set-Valued Process: 11052. - Danrun Huang; Daniel Scully; Achava Nakhash; Karl David (Am. Math. Mon., 2006)

An Identity Involving Rooted Forest: 11144. - Ernst Schulte-Geers; Karl David (Am. Math. Mon., 2007)