Conceptual Graphs and Formal Concept Analysis. In D. Lukose, H. Delugach, M. Keeler, L. Searle, and J. F. Sowa (Eds.), Conceptual Structures: Fulfilling Peirce's Dream, (1257):290--303, Springer, Heidelberg, 1997. [PUMA: ag1 analysis begriffsanalyse cg concept conceptual darmstadt fba fca formal graph graphs]