C. J. Ash

Finite semigroups with commuting idempotents

T. E. Hall, T. Hall, C. Ash, 1987, Journal of the Australian Mathematical Society. Series A. Pure Mathematics and Statistics.

Recursive labelling systems and stability of recursive structures in hyperarithmetical degrees

C. Ash, C. J. Ash, 1986 .

Persistently finite, persistently arithmetic theories

C. J. Ash, T. S. Millar, 1983 .