@article{GDZPPN00208581X,
title = {A general non-linear convexity theorem.},
journal = {Forum mathematicum},
volume = {9},
year = {1997},
pages = {613-640},
zbl = {0888.22005},
url = {http://dml.mathdoc.fr/item/GDZPPN00208581X}
}
Neeb, Karl-Hermann. A general non-linear convexity theorem.. Forum mathematicum, Tome 9 (1997) pp. 613-640. http://gdmltest.u-ga.fr/item/GDZPPN00208581X/