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Burkhardt, G., Esser, U., Hefele, H., Heinrich, I., Hoffmann, W., Krahn, D.,
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\newblock {\em Astronomy and Astrophysics Abstracts}, Vol. 49A,
\newblock Springer-Verlag, Heidelberg

\bibitem[\protect\astroncite{Daniel et~al.}{1989}]{daniel}
Daniel, H.-U., Berger, J., and Savaray, D.: 1989,
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\bibitem[\protect\astroncite{Lamport}{1986}]{lamport}
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\bibitem[\protect\astroncite{Patashnik}{1988}]{patashnik}
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