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McFadden R.: Homomorphisms of partially ordered semigroups onto groups. In: Acta scientiarum mathematicarum, (28) 3-4. pp. 251-254. (1967)
McFadden R.: On homomorphisms of partially ordered semigroups. In: Acta scientiarum mathematicarum, (28) 3-4. pp. 241-249. (1967)