13.		Balanço Energético 1987 - 1991 / Direcção Geral de Energia
14.		Balanço Energético 1985 - 1989 / Direcção Geral de Energia
15.		Plano Energético Nacional : documentos parte I. análise retrospectiva e recursos energéticos / Secretaria de Estado da Energia
16.		Hearing on integrated gasification combined cycles (I.G.C.C.) / Commission of the European Communities
17.		Environmental effects arising from electricity supply and utilisation and the resulting costs to the utility
18.		Gazomètre et transformateur, énergies nouvelles et société.
19.		Energy for our world : 11th World Energy Conference - Vol. RT A / Energy, Conference World Energy
20.		A procura de energia em Portugal: cenários alternativos
21.		Conferencia Mundial de la Energía: Simposium con ocasion de su asamblea anual
22.		11 World Energy Conference: technical papers : energy supply
23.		Compte rendu du 97e congrès de l'industrie du gaz : Paris, 22-26 Septembre 1980
24.		Spécifications C. 30 - 3 : complementary requirements concerning combination boilers and groupings of boilers with a total useful output 70kw and 3 500 kw / Association Technique de l' Industrie du Gaz en France