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Leschke, K., Pedit, F. & Pinkall, U. Willmore tori in the 4–Sphere with nontrivial normal bundle. Math. Ann. 332, 381–394 (2005). https://doi.org/10.1007/s00208-005-0630-x
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DOI: https://doi.org/10.1007/s00208-005-0630-x