@article{MAN_1995__303_4_165369,
     author = {Xianzhe Dai and Guofang Wei},
     title = {A comparison-estimate of {Topogonov} type for {Ricci} curvature.},
     journal = {Mathematische Annalen},
     pages = {297--306},
     publisher = {mathdoc},
     volume = {303},
     number = {4},
     year = {1995},
     zbl = {0834.53035},
     url = {http://geodesic.mathdoc.fr/item/MAN_1995__303_4_165369/}
}