@article{IM_1989__98_1_143726,
     author = {K. Shiohama and Y. Otsu and T. Yamaguchi},
     title = {A new version of differentiable sphere theorem.},
     journal = {Inventiones mathematicae},
     pages = {219--228},
     publisher = {mathdoc},
     volume = {98},
     number = {1},
     year = {1989},
     zbl = {0688.53016},
     url = {http://geodesic.mathdoc.fr/item/IM_1989__98_1_143726/}
}