| article html file updated | 7 February 2020 17:27 CET | Update | https://www.mdpi.com/2218-1989/6/4/40 |
| article html file updated | 22 September 2019 04:38 CEST | Update | - |
| article html file updated | 4 May 2019 23:35 CEST | Update | - |
| article html file updated | 28 December 2016 10:58 CET | Update | - |
| article pdf uploaded. | 3 November 2016 15:16 CET | Updated version of record | https://www.mdpi.com/2218-1989/6/4/40/pdf |
| article html file updated | 3 November 2016 13:45 CET | Original file | - |
| article xml uploaded. | 3 November 2016 13:44 CET | Update | https://www.mdpi.com/2218-1989/6/4/40/xml |
| article xml uploaded. | 3 November 2016 13:44 CET | Original file | - |
| article pdf uploaded. | 3 November 2016 13:44 CET | Version of Record | - |
