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Bouldin Richard: The distance to operators with a fixed index. In: Acta scientiarum mathematicarum, (54) 1-2. pp. 139-143. (1990)
Bouldin Richard: Best approximation of a normal operator in the trace norm. In: Acta scientiarum mathematicarum, (51) 3-4. pp. 467-474. (1987)
Bouldin Richard: Compact approximants. In: Acta scientiarum mathematicarum, (44) 1-2. pp. 5-11. (1982)
Bouldin Richard: Essential spectrum for a Banach space operator. In: Acta scientiarum mathematicarum, (41) 1-2. pp. 33-37. (1979)
Bouldin Richard; Rogers Donald D.: Normal dilations and operator approximations. In: Acta scientiarum mathematicarum, (39) 3-4. pp. 233-243. (1977)
Bouldin Richard: The convex structure of the set of positive approximants for a given operator. In: Acta scientiarum mathematicarum, (37) 3-4. pp. 177-190. (1975)
