| article html file updated | 9 February 2020 02:51 CET | Update | https://www.mdpi.com/2218-2004/6/1/4 |
| article html file updated | 29 September 2019 20:51 CEST | Update | - |
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| article html file updated | 12 January 2018 13:37 CET | Original file | - |
| article xml uploaded. | 12 January 2018 13:35 CET | Original file | https://www.mdpi.com/2218-2004/6/1/4/xml |
| article pdf uploaded. | 12 January 2018 13:35 CET | Version of Record | https://www.mdpi.com/2218-2004/6/1/4/pdf |
