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2. A comparative assessment of some airbreathing engines and their integration on the STS 2000 launchers;Dufour;IAF-90-193,1990
3. Progress in airbreathing combined engines for future european launchers;Doublier,1989
4. Air breathing combined engines for space transportation systems;Lardellier;ICAS-88-1.5.2,1988
5. Etude comparative de différents systèmes de propulsion combinée;Doublier,1990