@article{SLC_1991_26_a11,
     author = {Norbert Spangenberg and Karl Erich Wolff},
     title = {Interpretation von {Mustern} in {Kontexten} und {Begriffsverb\"anden}},
     journal = {S\'eminaire lotharingien de combinatoire},
     publisher = {mathdoc},
     volume = {26},
     year = {1991},
     url = {http://geodesic.mathdoc.fr/item/SLC_1991_26_a11/}
}