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\newblock {\em Astronomy and Astrophysics Abstracts}, Vol. 49A,
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\bibitem[\protect\astroncite{Daniel et~al.}{1989}]{daniel}
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\bibitem[\protect\astroncite{Lamport}{1986}]{lamport}
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\bibitem[\protect\astroncite{Patashnik}{1988}]{patashnik}
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