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\citation{HoOtto94}
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\citation{TMORAO97}
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\citation{OttoLa99}
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\citation{LjuOtTh06}
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\bibcite{OttoTh89}{1}
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\bibcite{HoOtto94}{4}
\bibcite{HeOtto96}{5}
\bibcite{HoOtto96}{6}
\bibcite{Otto96}{7}
\bibcite{MoOtTh97}{8}
\bibcite{TMORAO97}{9}
\bibcite{HoOtto98a}{10}
\bibcite{HoOtto98b}{11}
\bibcite{OttoLa99}{12}
\bibcite{TALNOR01}{13}
\bibcite{AhlOtto06}{14}
\bibcite{LjuOtTh06}{15}
\bibcite{OttoLa06}{16}