@article{AM2_1991__42_3_137428,
     author = {Kazimierz Nikodem},
     title = {On the support of midconvex operators.},
     journal = {Aequationes mathematicae},
     pages = {182--189},
     year = {1991},
     volume = {42},
     number = {3},
     zbl = {0747.39006},
     url = {http://geodesic.mathdoc.fr/item/AM2_1991__42_3_137428/}
}