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Yuzbashyan, EA and Happer, William and Altshuler, Boris L and Shastry, Sriram B (2003) Extracting hidden symmetry from the energy spectrum. In: Journal of Physics A Mathemetical and General, 36 (10). pp. 2577-2588.
Yuzbashyan, Emil A and Altshuler, Boris L and Shastry, Sriram B (2002) The origin of degeneracies and crossings in the 1d Hubbard model. In: Journal of Physics A: Mathematical and General, 35 (34). pp. 7525-7547.