Problem 10888. - William P. Wardlaw; William D. Withers (Am. Math. Mon., 2001)

Problem 11034. - William P. Wardlaw (Am. Math. Mon., 2003)

Homomorphisms of Quasigroups: 10888. - William P. Wardlaw; William D. Withers; Ellen Hertz; Horst Brunotte; et al. (Am. Math. Mon., 2003)

Problem 11083. - William P. Wardlaw (Am. Math. Mon., 2004)

Adjoint over the Smallest Field: 11034. - William P. Wardlaw; Richard Stong (Am. Math. Mon., 2005)

The Null Ideal of a Matrix: 11083. - William P. Wardlaw; Jean-Pierre Grivaux (Am. Math. Mon., 2006)

Problem 11323. - Jody M. Lockhart; William P. Wardlaw (Am. Math. Mon., 2007)

On the Sum of Integer Powers of a Matrix: 11323 [2007, 835]. - Jody M. Lockhart; William P. Wardlaw; O. P. Lossers (Am. Math. Mon., 2009)