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- [37] UNITARY REPRESENTATIONS OF UNITARY GROUP PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY-MATHEMATICAL AND PHYSICAL SCIENCES, 1969, 65 : 377 - &
- [39] APPROXIMATION BY UNITARY AND ESSENTIALLY UNITARY OPERATORS ACTA SCIENTIARUM MATHEMATICARUM, 1977, 39 (1-2): : 141 - 151