Conference mondiale de l'energie 14e Congres Montreal 89 = World Energy Conference 14th Congress Montreal 89 : l'energie demain = energy for tomorrow : L'ENERGIE ET LA TECHNOLOGIE = ENERGY AND TECHNOLOGY : HOUILLE ET CYCLE COMBINE = COAL AND COMBINED CYCLE ; PETROLE ET GAZ NATUREL = OIL AND NATUREL GAS. 4.2A/4.2B (Nepoznat, 1989)