| article html file updated | 5 February 2020 21:21 CET | Update | https://www.mdpi.com/2079-7737/1/2/260 |
| article html file updated | 8 May 2019 16:07 CEST | Update | - |
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| article xml file uploaded | 28 April 2014 10:22 CEST | Original file | https://www.mdpi.com/2079-7737/1/2/260/xml |
| article html file updated | 7 February 2013 13:53 CET | Update | - |
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| article html file updated | 23 January 2013 22:53 CET | Original file | - |