| article html file updated | 9 February 2020 01:17 CET | Update | https://www.mdpi.com/2073-4433/9/1/4 |
| article html file updated | 29 September 2019 12:10 CEST | Update | - |
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| article html file updated | 26 December 2017 16:55 CET | Original file | - |
| article xml uploaded. | 26 December 2017 16:53 CET | Update | https://www.mdpi.com/2073-4433/9/1/4/xml |
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| article pdf uploaded. | 26 December 2017 16:53 CET | Version of Record | https://www.mdpi.com/2073-4433/9/1/4/pdf |
