| article html file updated | 8 February 2020 00:05 CET | Update | https://www.mdpi.com/2218-1989/7/1/9 |
| article html file updated | 23 September 2019 11:54 CEST | Update | - |
| article html file updated | 4 May 2019 09:49 CEST | Update | - |
| article html file updated | 30 March 2017 11:59 CEST | Update | - |
| article html file updated | 23 February 2017 12:39 CET | Original file | - |
| article xml uploaded. | 23 February 2017 12:38 CET | Original file | https://www.mdpi.com/2218-1989/7/1/9/xml |
| article pdf uploaded. | 23 February 2017 12:38 CET | Version of Record | https://www.mdpi.com/2218-1989/7/1/9/pdf |
