| article html file updated | 6 February 2020 04:43 CET | Update | https://www.mdpi.com/2073-4441/5/4/1580 |
| article html file updated | 20 September 2019 01:40 CEST | Update | - |
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| article html file updated | 21 March 2019 05:27 CET | Update | - |
| article html file updated | 17 June 2015 13:38 CEST | Update | - |
| article html file updated | 14 November 2014 11:31 CET | Original file | - |
| article xml file uploaded | 14 November 2014 11:31 CET | Original file | https://www.mdpi.com/2073-4441/5/4/1580/xml |
| article pdf uploaded. | 7 October 2013 12:10 CEST | Version of Record | https://www.mdpi.com/2073-4441/5/4/1580/pdf |
