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- [2] MAXIMAL INVARIANCE AND UNBOUNDED OPERATORS - PRELIMINARY REPORT NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1972, 19 (01): : A180 - &
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- [9] CONTROLLABLE SYSTEMS IN BANACH-SPACE WITH UNBOUNDED OPERATORS - PRELIMINARY REPORT NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (02): : A311 - A312
- [10] UNBOUNDED OPERATORS WITH SPECTRAL DECOMPOSITION PROPERTIES ACTA SCIENTIARUM MATHEMATICARUM, 1980, 42 (1-2): : 67 - 70