1. Bernhard Ganter and Rudolf Wille. Formal Concept Analysis: Mathematical Foundations. Springer-Verlag New York, Inc., Heidelberg, 1999.

1. Rudolf Wille. Restructuring Lattice Theory: An Approach Based on Hierarchies on Concepts. In Ivan Rival, editor, Ordered Sets, Dordrecht-Boston, pages 445--470, 1982. Reidel.

1. B. Ganter and R. Wille. Applied Lattice Theory: Formal Concept Analysis, 1997. [WWW ]

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