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3. E.F. Jochim, H. Porsche, Einweg Doppler bei Bahnstörungen, Mathematische Verifizierung der von Porsche veröffentlichten Formel, DLR-Internal Report, 2005, unpublished.
4. H.K. Kuga, V. Orlando, Assessing orbit determination through one way Doppler signals, in: Proceedings of 17th International Symposium on Space Flight Dynamics, Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Moscow, June 16th–20th, Aerospace Sciences and Technology, 2003, Paper 12–3.
5. E.F. Jochim, Einweg Doppler bei Bahnstörungen, Mathematische Verifizierung der von Porsche veröffentlichten Formel, 2. Ansatz’ DLR-Internal Report, 2008.