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On parabolic and umbilic points of immersed hypersurfaces. (English) Zbl 0147.21304


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[1] E. A. Feldman, The geometry of immersions. I, Trans. Amer. Math. Soc. 120 (1965), 185 – 224. · Zbl 0137.17803
[2] E. A. Feldman, Geometry of immersions. II, Trans. Amer. Math. Soc. 125 (1966), 181 – 215. · Zbl 0156.42401
[3] E. A. Feldman, The geometry of immersions. II, Bull. Amer. Math. Soc. 70 (1964), 600 – 607. · Zbl 0146.19904
[4] William Francis Pohl, Differential geometry of higher order, Topology 1 (1962), 169 – 211. · Zbl 0112.36605
[5] Hassler Whitney, Elementary structure of real algebraic varieties, Ann. of Math. (2) 66 (1957), 545 – 556. · Zbl 0078.13403
[6] H. Hopf, Lectures on differential geometry in the large, Mimeographed notes, Stanford Univ., Stanford, Calif., 1956.
[7] Dirk J. Struik, Lectures on Classical Differential Geometry, Addison-Wesley Press, Inc., Cambridge, Mass., 1950. · Zbl 0041.48603
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