Jörg F. Wagner: From Bohnenberger's Machine to Integrated Navigation Systems. 200 Years of Inertial Navigation. Photogrammetric Week 05. "Photogrammetric Week 2005"(PDF). Archived(PDF) from the original on 2007-07-06. Retrieved 2022-12-04.
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Jörg F. Wagner: From Bohnenberger's Machine to Integrated Navigation Systems. 200 Years of Inertial Navigation. Photogrammetric Week 05. "Photogrammetric Week 2005"(PDF). Archived(PDF) from the original on 2007-07-06. Retrieved 2022-12-04.