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Lejeune, A., Sakaguchi, K., & Imanaka, T. (1989). A spectrophotometric assay for the cyclization activity of cyclomaltohexaose (α-cyclodextrin) glucanotransferase. Analytical Biochemistry, 181(1), 6–11. doi:10.1016/0003-2697(89)90385-0 
10.1016/0003-2697(89)90385-0