@article{10_1007_s10587_016_0240_7,
     author = {Mao, Jing},
     title = {Volume comparison theorems for manifolds with radial curvature bounded},
     journal = {Czechoslovak Mathematical Journal},
     pages = {71--86},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {2016},
     doi = {10.1007/s10587-016-0240-7},
     mrnumber = {3483223},
     zbl = {06587874},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-016-0240-7/}
}