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Completely O-simple semigroups III. Math Proc Camb Phil Soc. 105:263-275.. 1989.
A new approach to orders in simple rings with minimal one-sided ideals. Semigroup Forum. 41:267-290.. 1990.
Orders in normal bands of groups. Mathematika. 43:295-319.. 1997.
Department of Mathematics, University of York, Heslington, York, UK. YO10 5DD