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2. ——, Commutators Symbols and Determining Functions,J. Functional Analysis 19(1975) 50–80
3. -- Almost Commuting Pairs of Unitary Operators and Flat Currents, to appear in J. of Integral Eq. and Operator Theory
4. -- The Structure of Intertwing Isometries,II ,unpublished typed manuscript distributed as a preprint in 1974
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