Deszcz, Ryszard and Ewert-Krzemieniewski, Stanislaw. "NOTES ON MANIFOLDS ADMITTING TOTALLY UMBILICAL HYPERSURFACES"
Demonstratio Mathematica, vol. 20, no. 3-4, 1987, pp. 457-470.
https://doi.org/10.1515/dema-1987-3-412
Deszcz, R. and Ewert-Krzemieniewski, S. (1987) NOTES ON MANIFOLDS ADMITTING TOTALLY UMBILICAL HYPERSURFACES. Demonstratio Mathematica, Vol. 20 (Issue 3-4), pp. 457-470.
https://doi.org/10.1515/dema-1987-3-412
Deszcz, Ryszard and Ewert-Krzemieniewski, Stanislaw. "NOTES ON MANIFOLDS ADMITTING TOTALLY UMBILICAL HYPERSURFACES"
Demonstratio Mathematica 20, no. 3-4 (1987): 457-470.
https://doi.org/10.1515/dema-1987-3-412
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