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Ramos-Real, F. J., Tovar, B., Iootty, M., de Almeida, E. F., & Pinto, H. Q, Jr. (2009). The
evolution and main determinants of productivity in Brazilian electricity distribution
1998 - 2005: An empirical analysis. Energy Economics, 31, 298 - 305.
Yamada, Y., Matui, T., & e Sugiyama, M. (1994). New analysis of efficiency based on DEA.
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