@article{MM2_1996__91_3_156212,
     author = {Wolfgang W. Breckner},
     title = {Characterizations of ultrabarrelledness and barrelledness involving the singularities of families of convex mappings.},
     journal = {Manuscripta mathematica},
     pages = {17--34},
     publisher = {mathdoc},
     volume = {91},
     number = {3},
     year = {1996},
     zbl = {0871.46001},
     url = {http://geodesic.mathdoc.fr/item/MM2_1996__91_3_156212/}
}