11 | Add to Reading ListSource URL: www.redalyc.orgLanguage: English - Date: 2013-07-18 14:56:20
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12 | Add to Reading ListSource URL: mapress.comLanguage: English - Date: 2011-10-12 15:50:24
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13 | Add to Reading ListSource URL: pte.up.poznan.plLanguage: English - Date: 2008-10-24 04:57:04
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14 | Add to Reading ListSource URL: www.redalyc.orgLanguage: English - Date: 2013-07-18 14:56:25
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15 | Add to Reading ListSource URL: www.sinica.edu.twLanguage: English - Date: 2000-12-01 21:29:20
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16 | Add to Reading ListSource URL: pte.au.poznan.plLanguage: English - Date: 2009-10-13 05:37:24
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