@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/