| article html file updated | 6 February 2020 01:24 CET | Update | https://www.mdpi.com/1424-8247/6/4/500 |
| article html file updated | 8 May 2019 06:30 CEST | Update | - |
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| article html file updated | 13 September 2013 17:18 CEST | Original file | - |
| article xml file uploaded | 13 September 2013 17:18 CEST | Original file | https://www.mdpi.com/1424-8247/6/4/500/xml |
| article pdf uploaded. | 8 April 2013 15:11 CEST | Version of Record | https://www.mdpi.com/1424-8247/6/4/500/pdf |
