@article{SLC_1987_18_a13,
     author = {Karl Erich Wolff},
     title = {Begriffsanalytische {Datenauswertung}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {18},
     year = {1987},
     url = {http://geodesic.mathdoc.fr/item/SLC_1987_18_a13/}
}