@article{MM2_1994__85_3-4_156009,
     author = {Changyu Xia},
     title = {Rigidity and sphere theorem for manifolds with positive {Ricci} {Curvature.}},
     journal = {Manuscripta mathematica},
     pages = {79--88},
     publisher = {mathdoc},
     volume = {85},
     number = {3-4},
     year = {1994},
     zbl = {0821.53034},
     url = {http://geodesic.mathdoc.fr/item/MM2_1994__85_3-4_156009/}
}