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Look at thisthe paper paperQuantum Affine Algebras at Roots of Unity of Chari and Pressley (published as https://doi.org/10.1090/S1088-4165-97-00030-7).
Look at this paper of Chari and Pressley.
Look at the paper Quantum Affine Algebras at Roots of Unity of Chari and Pressley (published as https://doi.org/10.1090/S1088-4165-97-00030-7).
Look at this paperpaper of Chari and Pressley.
