@article{MZ_1996__221_1_174846,
     author = {Viorel Vajaitu},
     title = {q-completeness and q-concavity of the union of open subspaces.},
     journal = {Mathematische Zeitschrift},
     pages = {217--230},
     publisher = {mathdoc},
     volume = {221},
     number = {1},
     year = {1996},
     zbl = {0844.32014},
     url = {http://geodesic.mathdoc.fr/item/MZ_1996__221_1_174846/}
}