@article{GDZPPN002069040,
title = {Mass of rays in Alexandrov spaces of nonnegative curvature.},
journal = {Commentarii mathematici Helvetici},
volume = {69},
year = {1994},
pages = {208-228},
zbl = {0818.53080},
url = {http://dml.mathdoc.fr/item/GDZPPN002069040}
}
Shioya, Takashi. Mass of rays in Alexandrov spaces of nonnegative curvature.. Commentarii mathematici Helvetici, Tome 69 (1994) pp. 208-228. http://gdmltest.u-ga.fr/item/GDZPPN002069040/