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References:
[1] T. Otsuki: Surfaces in the 4-dimensional Euclidean space isometric to a sphere. Kodai Math. Sem. Rep. 18 (1966). DOI 10.2996/kmj/1138845191 | MR 0203654 | Zbl 0163.16001
[2] T. Otsuki: On the total curvature of surfaces in Euclidean spaces. Japanese J. Math. 35 (1966), 61-71. MR 0200806 | Zbl 0148.15002
[3] A. Švec: Three theorems on ovaloids. Seminar on global geometry 1973 (preprint).
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