Geodesic
A~submanifold in $P^n$ with parallel normal subbundle which is normalized in the sense of Norden
Matematičeskie zametki, Tome 22 (1977) no. 5, pp. 649-662.

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The concept of a $p$-dimensional parallel subbundle of the normal bundle of a submanifold $V^m$ of $n$-dimensional protective space $P^n$ normalized in the sense of Norden [1] is introduced. The local structure of such manifolds is studied. The structure is also investigated of submanifolds $V^m$ which have normal subbundles with a flat projective connection. Their structure is closely related with the structure of tangentially degenerate submanifolds [2, 3] and submanifolds admitting a dual normalization [4]. 
@article{MZM_1977_22_5_a5,
     author = {A. V. Chakmazyan},
     title = {A~submanifold in $P^n$ with parallel normal subbundle which is normalized in the sense of {Norden}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {649--662},
     publisher = {mathdoc},
     volume = {22},
     number = {5},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_22_5_a5/}
}
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%A A. V. Chakmazyan
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%J Matematičeskie zametki
%D 1977
%P 649-662
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%F MZM_1977_22_5_a5
A. V. Chakmazyan. A~submanifold in $P^n$ with parallel normal subbundle which is normalized in the sense of Norden. Matematičeskie zametki, Tome 22 (1977) no. 5, pp. 649-662. http://geodesic.mathdoc.fr/item/MZM_1977_22_5_a5/