@article{SM_1989_62_1_a10,
     author = {A. A. Borisenko and A. L. Yampol'skii},
     title = {On the {Sasaki} metric of the normal bundle of a~submanifold in {a~Riemannian} space},
     journal = {Sbornik. Mathematics},
     pages = {157--175},
     year = {1989},
     volume = {62},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1989_62_1_a10/}
}