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\bibitem{rice85}
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\bibitem{rice93}
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\bibitem{sand94}
{\sc Sanderson{\rm , M.~J.}, {\rm and} {\rm M.~J. }Donoghue},
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\bibitem{sand96}
{\sc Sanderson{\rm , M.~J.}, {\rm and} {\rm M.~J. }Donoghue},
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\bibitem{saru94}
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\bibitem{schl96}
{\sc Schluter{\rm , D.}},
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\bibitem{slow90}
{\sc Slowinski{\rm , J.~B.}, {\rm and} {\rm C.~}Guyer},
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\bibitem{sumi94}
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\bibitem{todd91}
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\bibitem{vanv84}
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