| article html file updated | 1 March 2023 01:54 CET | Update | https://www.mdpi.com/1424-8220/6/6/616 |
| article html file updated | 5 February 2020 09:41 CET | Update | N/A |
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| article html file updated | 27 December 2013 08:35 CET | Original file | N/A |
| article xml file uploaded | 27 December 2013 08:35 CET | Original file | https://www.mdpi.com/1424-8220/6/6/616/xml |
