@article{GDZPPN002038056,
title = {Additive selections of superadditive set-valued functions.},
journal = {Aequationes mathematicae},
volume = {40},
year = {1990},
pages = {121-128},
zbl = {0706.39006},
url = {http://dml.mathdoc.fr/item/GDZPPN002038056}
}
Smajdor, A. Additive selections of superadditive set-valued functions.. Aequationes mathematicae, Tome 40 (1990) pp. 121-128. http://gdmltest.u-ga.fr/item/GDZPPN002038056/