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@article{vanderBurg+deLeeuw+Dijksterhuis:94,
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@article{Michailidis+deLeeuw:01,
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@INCOLLECTION{deLeeuw+Michailides+Wang:99,
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@Manual{R:07,
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       author       = {{R Development Core Team}},
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       year         = 2008,
       note         = {{ISBN} 3-900051-07-0},
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