"Intersociety Energy Conversion Engineering Conference (26th : 1991 : Boulder, Colo.)" . . . "Intersociety Energy Conversion Engineering Conference (26th : 1991 : Boston, Mass.)" . . . "Économies d'énergie Congrès." . . "Énergie Conservation Congrès." . . "Ressources énergétiques Aspect de l'environnement Congrès." . . . . . . . . . "Energy and the environment : A continuing partnership"@en . . "Proceedings of the 26th Intersociety Energy Conversion Engineering Conference : IECEC-91, August 4-9, 1991, Boston, Mass"@en . . . "Conference papers and proceedings"@en . "Conference papers and proceedings" . . . . "Proceedings of the 26th Intersociety Energy Conversion Engineering Conference : IECEC-91, August 4-9, 1991, Boston, Massachusetts" . . . . . "Proceedings of the 26th Intersociety Energy Conversion Engineering Conference IECEC-91, August 4-9, 1991, Boston, Mass"@en . . . "Proceedings of the 26th Intersociety Energy Conversion Engineering Conference" . "Proceedings of the 26th Intersociety Energy Conversion Engineering Conference IECEC-91, August 4-9, 1991, Boston, Massachusetts"@en . "1991 26th Intersociety Energy Conversion Engineering Conference" . . . . "IECEC '91"@en . . . . . . . . "Énergie Conversion directe Congrès." . . . .