@article{BAG_1992__33_138512,
     author = {S. Umbreit},
     title = {Properties of {Prealgebraic} {Lattices} {Investigated} by {Means} of {Formal} {Concept} {Analysis}},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {139--152},
     publisher = {mathdoc},
     volume = {33},
     year = {1992},
     zbl = {0769.06006},
     url = {http://geodesic.mathdoc.fr/item/BAG_1992__33_138512/}
}