Reihe Trends in LogicPiero Pagliani × A Geometry of ApproximationRough Set Theory: Logic, Algebra and Topology of Conceptual PatternsPiero PaglianiSpringer NetherlandSoftcover2010 A Geometry of ApproximationRough Set Theory: Logic, Algebra and Topology of Conceptual PatternsPiero PaglianiSpringer NetherlandHardcover2008 A Geometry of ApproximationRough Set Theory: Logic, Algebra and Topology of Conceptual PatternsPiero PaglianiSpringer NetherlandeBook2008