@article{MZ_1993__212_4_174484,
     author = {Takashi Shioya},
     title = {Splitting theorems for nonnegatively curved open manifolds with large ideal boundary.},
     journal = {Mathematische Zeitschrift},
     pages = {223--238},
     publisher = {mathdoc},
     volume = {212},
     number = {4},
     year = {1993},
     zbl = {0791.53045},
     url = {http://geodesic.mathdoc.fr/item/MZ_1993__212_4_174484/}
}