The original version of the journal is the paper version
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19 (2009)no. 1
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20 (2010)no. 1
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21 (2011)no. 1
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22 (2012)no. 1
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23 (2013)no. 1
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24 (2014)no. 1
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25 (2015)no. 1
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26 (2016)no. 1
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