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Putnam Calvin Richard: Pure subnormality and spectral stability. In: Acta scientiarum mathematicarum, (57) 1-4. pp. 223-232. (1993)
Putnam Calvin Richard: Generalized projections for hyponormal and subnormal operators. In: Acta scientiarum mathematicarum, (53) 1-2. pp. 187-190. (1989)
Putnam Calvin Richard: A connection between the unitary dilation and the normal extension of a subnormal contraction. In: Acta scientiarum mathematicarum, (50) 3-4. pp. 421-425. (1986)
Putnam Calvin Richard: Dissipative J-self-adjoint operators and associated J-isometries. In: Acta scientiarum mathematicarum, (37) 1-2. pp. 109-113. (1975)
