"Danmark (1981 : Essen)" . . . "Gesellschaft Deutscher Chemiker (Frankfurt/Main)" . . "Hydrogen as fuel." . . "Haus der Technik (Essen, Germany)" . . "Haus der Technik (Essen, Allemagne)" . . . . . . . "Hydrogen : energy victor of the future, conference held on 24/25, March 1981" . "Conference papers and proceedings" . "Conference papers and proceedings"@en . . . . "Hydrogen : energy vector of the future : [proceedings of a] conference held on 24/25 March 1981"@en . . "Hydrogen : energy vector of the future : conference held on 24/25 March 1981" . . . . . . . . . . . "Hydrogen energy vector of the future : conference held on 24-25 March 1981" . "Hydrogen energy vector of the future : conference held on 24-25 March 1981"@en . . . "Wasserstoff, Energieträger der Zukunft" . "Wasserstoff, Energieträger der Zukunft"@en . . . . . . . . . . . "Conference proceedings"@en . "Conference proceedings" . "Hydrogen : energy vector of the future : conference held on 24-25 March 1981" . . "Hydrogen : energy vector of the future; conference held on 24/25 March 1981 ; organized by Haus der Technik, Essen, in conjunction with the Gesellschaft Deutscher Chemiker,Frankfurt/Main" . "Gesellschaft Deutscher Chemiker." . . . . "Conference on Hydrogen: Energy Vector of the Future (1981 : Essen)" . . . "Gesellschaft Deutscher Chemiker (Frankfurt a. M.)" . . . "Hydrogen as fuel Congresses." . . "Haus der Technik (Essen)" . . "Haus der Technik (Essen)" . . .