| article html file updated | 5 February 2020 09:40 CET | Update | https://www.mdpi.com/1424-8220/6/4/260 |
| article html file updated | 9 May 2019 16:44 CEST | Update | - |
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| article html file updated | 19 March 2019 12:56 CET | Update | - |
| article html file updated | 27 December 2013 08:31 CET | Original file | - |
| article xml file uploaded | 27 December 2013 08:31 CET | Original file | https://www.mdpi.com/1424-8220/6/4/260/xml |
