| article html file updated | 7 February 2020 20:26 CET | Update | https://www.mdpi.com/2073-4360/9/1/7 |
| article html file updated | 22 September 2019 15:57 CEST | Update | N/A |
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| article html file updated | 28 December 2016 10:52 CET | Original file | N/A |
| article xml uploaded. | 28 December 2016 10:33 CET | Original file | https://www.mdpi.com/2073-4360/9/1/7/xml |
| article pdf uploaded. | 28 December 2016 10:33 CET | Version of Record | https://www.mdpi.com/2073-4360/9/1/7/pdf |
