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Adams, Michael E. and Clark, David M.: Endomorphism monoids in minimal quasi primal varieties. Acta scientiarum mathematicarum, (54) 1-2. pp. 37-52. (1990)
Clark, David M. and Krauss, Peter H.: Topological quasi varieties. Acta scientiarum mathematicarum, (47) 1-2. pp. 3-39. (1984)