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ON THE SZ=O EXCITED-STATES OF AN ANISOTROPIC HEISENBERG CHAIN
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EXCITATIONS WITH COMPLEX WAVENUMBERS IN A HUBBARD CHAIN .1. STATES WITH ONE PAIR OF COMPLEX WAVENUMBERS
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EXCITATIONS WITH COMPLEX WAVENUMBERS IN A HUBBARD CHAIN .2. STATES WITH SEVERAL PAIRS OF COMPLEX WAVENUMBERS
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