Odd perfect numbers have at least nine distinct prime factors. - Pace P. Nielsen (Math. Comput., 2007)

Sieve methods for odd perfect numbers. - S. Adam Fletcher; Pace P. Nielsen; Pascal Ochem (Math. Comput., 2012)

Derivations and bounded nilpotence index. - Pace P. Nielsen; Michal Ziembowski (Int. J. Algebra Comput., 2015)

Odd perfect numbers, Diophantine equations, and upper bounds. - Pace P. Nielsen (Math. Comput., 2015)

Exchange rings, exchange equations, and lifting properties. - Dinesh Khurana; T. Y. Lam; Pace P. Nielsen (Int. J. Algebra Comput., 2016)

On Vaughan Pratt's crossword problem. - George M. Bergman; Pace P. Nielsen (J. Lond. Math. Soc., 2016)

Definitional schemes for primitive recursive and computable functions. - Pace P. Nielsen (Comput., 2022)