Václav Snásel Martin Polovincak Hussam M. Dahwa Abdulla Concept Lattice Reduction by Singular Value Decomposition. 2007 SYRCoDIS http://ceur-ws.org/Vol-256/submission_18.pdf conf/syrcodis/2007 db/conf/syrcodis/syrcodis2007.html#SnaselPA07