Answers are grounded in this paper and cite their sources.
By Christian Kassel: 531 pp., DM.79.–, isbn 3 540 94370 6 (Springer, 1995). QUANTUM GROUPS AND THEIR PRIMITIVE IDEALS (Modern Surveys in Mathematics 29) By Anthony Joseph: 383 pp., DM.198.–, isbn 3 540 57057 8 (Springer, 1995).
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Andrew Pressley (1997) studied this question.
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