@article{GFA_1994__4_6_58153,
     author = {S.M. Gersten},
     title = {Quadratic {Divergence} of {Geodesics} in {CAT} (0) {Spaces.}},
     journal = {Geometric and functional analysis},
     pages = {37--51},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1994},
     zbl = {0809.53054},
     url = {http://geodesic.mathdoc.fr/item/GFA_1994__4_6_58153/}
}