| article html file updated | 7 February 2020 19:05 CET | Update | https://www.mdpi.com/2218-1989/6/4/44 |
| article html file updated | 22 September 2019 08:46 CEST | Update | N/A |
| article html file updated | 4 May 2019 20:22 CEST | Update | N/A |
| article html file updated | 28 December 2016 10:58 CET | Update | N/A |
| article html file updated | 5 December 2016 08:36 CET | Original file | N/A |
| article xml uploaded. | 5 December 2016 08:35 CET | Original file | https://www.mdpi.com/2218-1989/6/4/44/xml |
| article pdf uploaded. | 5 December 2016 08:35 CET | Version of Record | https://www.mdpi.com/2218-1989/6/4/44/pdf |
