@article{MZ_1986__192_173748,
     author = {Robert DeVos},
     title = {Combinations of {Distinguished} {Subsets} and {Conullity.}},
     journal = {Mathematische Zeitschrift},
     pages = {447--452},
     publisher = {mathdoc},
     volume = {192},
     year = {1986},
     zbl = {0627.46006},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__192_173748/}
}