@article{MZ_1971__122_171610,
     author = {D. Brignole and N.C.A. Da Costa},
     title = {On {Supernormal} {Ehresmann-Dedecker} {Universes.}},
     journal = {Mathematische Zeitschrift},
     pages = {342--350},
     year = {1971},
     volume = {122},
     zbl = {0215.32603},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__122_171610/}
}