25.		Energy for our World : 11Th World Energy Conference / World Energy Conference
26.		Energy for our World : 11Th World Energy Conference / World Energy Conference
27.		Energy for our World : 11Th World Energy Conference / World Energy Conference
28.		Energy for our World. 11Th World Energy Conference / World Energy Conference
29.		Relatório - exercício 1979 / Electricidade de Portugal - EDP, E.P.