| article html file updated | 8 February 2020 22:46 CET | Update | https://www.mdpi.com/2073-4468/6/4/22 |
| article html file updated | 28 September 2019 21:27 CEST | Update | - |
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| article html file updated | 1 December 2017 11:16 CET | Original file | - |
| article xml uploaded. | 1 December 2017 11:14 CET | Original file | https://www.mdpi.com/2073-4468/6/4/22/xml |
| article pdf uploaded. | 1 December 2017 11:14 CET | Version of Record | https://www.mdpi.com/2073-4468/6/4/22/pdf |
