| article html file updated | 6 February 2020 22:26 CET | Update | https://www.mdpi.com/1996-1073/8/9/9620 |
| article html file updated | 6 May 2019 12:04 CEST | Update | N/A |
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| article html file updated | 12 October 2015 10:31 CEST | Update | N/A |
| article xml file uploaded | 12 October 2015 10:31 CEST | Update | https://www.mdpi.com/1996-1073/8/9/9620/xml |
| article html file updated | 22 September 2015 12:57 CEST | Original file | N/A |
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| article pdf uploaded. | 3 September 2015 11:10 CEST | Version of Record | https://www.mdpi.com/1996-1073/8/9/9620/pdf |