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Švec, Alois
On the existence of parallel normal vector fields of surfaces in $E^4$. (English). Czechoslovak Mathematical Journal, vol. 26 (1976), issue 2, pp. 297-303
MSC: 53A05 | MR 0405253 | Zbl 0337.53044 | DOI: 10.21136/CMJ.1976.101402
References:
[1] B. Wegner: Codazzi-Tensoren und Kennzeichnungen sphärischer Immersionen. Journal of Diff. Geom., Vol. 9, 1974, 61-70. MR 0362158 | Zbl 0278.53041
[2] U. Simon: A further method in global differential geometry. Abh. Math. Sem. Hamburg, 44, 1975, 52-69. DOI 10.1007/BF02992946 | MR 0394513
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