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Author: Rainer, Armin

• Rainer, Armin: Orbit projections as fibrations. (English). Czechoslovak Mathematical Journal, vol. 59 (2009), issue 2, pp. 529-538
• Rainer, Armin: Orbit projections of proper Lie groupoids as fibrations. (English). Czechoslovak Mathematical Journal, vol. 59 (2009), issue 3, pp. 591-594