4Bourguignon, F.Deoom posahle Income Inequality Measures.Econometrica, 1979, 47(4),901 -920.
5Cowell, F.A, Flachaire, E., Income distribution and ine-quetity measurement : The problem of extreme valeus .Jour-nal of Econometrics (2007),doi: 10.1016 / J. jeconom.2007.01.001.