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Douglas Roy George: On the operator equation S*XT= X and related topics. In: Acta scientiarum mathematicarum, (30) 1-2. pp. 19-32. (1969)
Douglas Roy George; Pearcy Carl: A characterization of thin operators. In: Acta scientiarum mathematicarum, (29) 3-4. pp. 295-297. (1968)