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by Burkhardt, G.; Esser, U.; Hefele, H.; et al.
by Astronomisches Rechen-Institut; Heinrich, Inge; Master, Lutz Schmadel
by Böhme, S.; Esser, U.; Hefele, H.; et al.
by Böhme, S.; Fricke, Walter; Hefele, H.; et al.
by Böhme, S.; Fricke, W.; Hefele, H.; et al.
by Pankaj Jain
by Wolfram Schmidt; Marcel Völschow
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by Snell; Ronald L.
by Marr; Jonathan M.