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WikiPedia: Keldysh bomber https://web.archive.org/web/20060614175120/http://... https://web.archive.org/web/20071009055651/http://... https://web.archive.org/web/20110807005346/http://... http://www.astronautix.com/data/saenger.pdf http://www.astronautix.com/k/keldyshbomber.html http://www.pp.htv.fi/jwestman/space/sang-e.html