@article{BAG_1991__31_138474,
     author = {G. RICHTER},
     title = {Abstract independence in lattices},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {57--68},
     year = {1991},
     volume = {31},
     url = {http://geodesic.mathdoc.fr/item/BAG_1991__31_138474/}
}