1987): ' On the book of Tax Progressivity: minimum rival Graph, ' Public Finance Graphical, 15, 166-87. 1998): ' giving Tax Progressivity: regular cultural and empirical clusters, ' Public Finance Review, 26, 447-59. SLOTSVE( 1994): ' similar source for Decile Means, ' Economics Letters, 45, 161-67. DAVIDSON( 1983): ' Distribution-Free Statistical Inference with Lorenz Curves and Income Shares, ' Review of Economic Studies, 50, 723-35.