| article html file updated | 7 February 2020 20:45 CET | Update | https://www.mdpi.com/2227-9067/4/1/2 |
| article html file updated | 22 September 2019 17:42 CEST | Update | N/A |
| article html file updated | 4 May 2019 16:52 CEST | Update | N/A |
| article html file updated | 9 February 2017 07:57 CET | Update | N/A |
| article html file updated | 4 January 2017 09:40 CET | Original file | N/A |
| article xml uploaded. | 4 January 2017 09:39 CET | Original file | https://www.mdpi.com/2227-9067/4/1/2/xml |
| article pdf uploaded. | 4 January 2017 09:39 CET | Version of Record | https://www.mdpi.com/2227-9067/4/1/2/pdf |
