| article html file updated | 7 February 2020 19:47 CET | Update | https://www.mdpi.com/1996-1073/9/12/1068 |
| article html file updated | 22 September 2019 12:27 CEST | Update | - |
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| article html file updated | 28 December 2016 09:07 CET | Update | - |
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| article xml uploaded. | 16 December 2016 11:19 CET | Original file | https://www.mdpi.com/1996-1073/9/12/1068/xml |
| article pdf uploaded. | 16 December 2016 11:19 CET | Version of Record | https://www.mdpi.com/1996-1073/9/12/1068/pdf |
