2
Published in 2011
doi: 10.1016/j.gr.2010.09.003
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6
Published in 2002
doi: 10.1016/S1342-937X(05)70910-2
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9
Published in 2007
doi: 10.1016/j.gr.2006.10.013
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12
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18
Published in 2009
doi: 10.1016/j.gr.2009.01.004
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