| article html file updated | 8 February 2020 21:13 CET | Update | https://www.mdpi.com/2310-2861/3/4/43 |
| article html file updated | 2 May 2019 14:56 CEST | Update | - |
| article html file updated | 15 November 2017 09:47 CET | Original file | - |
| article xml uploaded. | 15 November 2017 09:46 CET | Original file | https://www.mdpi.com/2310-2861/3/4/43/xml |
| article pdf uploaded. | 15 November 2017 09:46 CET | Version of Record | https://www.mdpi.com/2310-2861/3/4/43/pdf |
