Anna A. Shaverdian Hao Zhou George Michailidis H. V. Jagadish Algebraic visual analysis: the Catalano phone call data set case study. 74-82 2009 KDD Workshop on Visual Analytics and Knowledge Discovery http://doi.acm.org/10.1145/1562849.1562858 conf/kdd/2009vakd db/conf/kdd/vakd2009.html#ShaverdianZMJ09