| article html file updated | 6 February 2020 01:14 CET | Update | https://www.mdpi.com/1424-8247/6/4/469 |
| article html file updated | 19 September 2019 19:13 CEST | Update | - |
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| article xml file uploaded | 13 September 2013 17:18 CEST | Original file | https://www.mdpi.com/1424-8247/6/4/469/xml |
| article pdf uploaded. | 26 March 2013 17:38 CET | Version of Record | https://www.mdpi.com/1424-8247/6/4/469/pdf |
