@article{SLC_1988_19_a13,
     author = {Karl Erich Wolff},
     title = {Einf\"uhrung in die {Formale} {Begriffsanalyse}},
     journal = {S\'eminaire lotharingien de combinatoire},
     year = {1988},
     volume = {19},
     url = {http://geodesic.mathdoc.fr/item/SLC_1988_19_a13/}
}