| article html file updated | 6 February 2020 04:46 CET | Update | https://www.mdpi.com/1424-8247/6/10/1221 |
| article html file updated | 7 May 2019 23:37 CEST | Update | - |
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| article xml file uploaded | 5 November 2013 09:23 CET | Original file | https://www.mdpi.com/1424-8247/6/10/1221/xml |
| article pdf uploaded. | 10 October 2013 09:49 CEST | Version of Record | https://www.mdpi.com/1424-8247/6/10/1221/pdf |
