The Theil Index in Sequences of Nested and Hierarchic Grouping Structures: Implications for the Measurement of Inequality through Time, with Data Aggregated at Different Levels of Industrial Classification
Pedro Conceição, James Galbraith, Peter Bradford
Eastern Economic Journal, vol. 27, 2001, p. 491-514.

Constructing Long and Dense Time-Series of Inequality Using the Theil Index
Pedro Conceição, James Galbraith
Eastern Economic Journal, vol. 26, 2000, p. 61-74.