@article{GDZPPN002095386,
title = {Busemann Functions and Total Curvature.},
journal = {Inventiones mathematicae},
volume = {55},
year = {1979},
pages = {281-297},
zbl = {0433.53050},
url = {http://dml.mathdoc.fr/item/GDZPPN002095386}
}
Shiohama, Katsuhiro. Busemann Functions and Total Curvature.. Inventiones mathematicae, Tome 55 (1979) pp. 281-297. http://gdmltest.u-ga.fr/item/GDZPPN002095386/