| article html file updated | 7 February 2020 16:15 CET | Update | https://www.mdpi.com/2218-1989/6/4/34 |
| article html file updated | 22 September 2019 02:39 CEST | Update | - |
| article html file updated | 5 May 2019 01:51 CEST | Update | - |
| article html file updated | 28 December 2016 10:56 CET | Update | - |
| article html file updated | 13 October 2016 04:28 CEST | Original file | - |
| article xml uploaded. | 13 October 2016 04:26 CEST | Update | https://www.mdpi.com/2218-1989/6/4/34/xml |
| article xml uploaded. | 13 October 2016 04:26 CEST | Original file | - |
| article pdf uploaded. | 13 October 2016 04:26 CEST | Version of Record | https://www.mdpi.com/2218-1989/6/4/34/pdf |
