| article html file updated | 7 February 2020 17:23 CET | Update | https://www.mdpi.com/2218-1989/6/4/39 |
| article html file updated | 22 September 2019 04:31 CEST | Update | N/A |
| article html file updated | 4 May 2019 23:43 CEST | Update | N/A |
| article html file updated | 28 December 2016 10:58 CET | Update | N/A |
| article html file updated | 2 November 2016 12:26 CET | Original file | N/A |
| article xml uploaded. | 2 November 2016 12:25 CET | Update | https://www.mdpi.com/2218-1989/6/4/39/xml |
| article xml uploaded. | 2 November 2016 12:25 CET | Update | N/A |
| article xml uploaded. | 2 November 2016 12:25 CET | Original file | N/A |
| article pdf uploaded. | 2 November 2016 12:25 CET | Version of Record | https://www.mdpi.com/2218-1989/6/4/39/pdf |
