1. Plano 90, Plano 2000;Eletrobrás,1985
2. Brazilian Energy Model;Ministry of Mines and Energy,1979
3. Personal communication from an economist then working at the Ministry of Planning (SEPLAN).
4. Principais Indicadores 1973–1984;Petrobrás,1985
5. Informativo Anual da Indústria Carbonifera, ano base 1984, Ministerio de Minas e Energia, Brasilia, Brazil.