| article html file updated | 9 February 2020 02:13 CET | Update | https://www.mdpi.com/2227-7102/8/1/6 |
| article html file updated | 29 September 2019 17:24 CEST | Update | - |
| article html file updated | 2 May 2019 04:00 CEST | Update | - |
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| article html file updated | 27 March 2018 15:17 CEST | Update | - |
| article html file updated | 6 January 2018 12:10 CET | Original file | - |
| article xml uploaded. | 6 January 2018 12:09 CET | Update | https://www.mdpi.com/2227-7102/8/1/6/xml |
| article pdf uploaded. | 6 January 2018 12:09 CET | Version of Record | https://www.mdpi.com/2227-7102/8/1/6/pdf |
