| article html file updated | 7 February 2020 09:29 CET | Update | https://www.mdpi.com/2218-1989/6/2/17 |
| article html file updated | 5 May 2019 14:14 CEST | Update | - |
| article html file updated | 27 March 2019 06:09 CET | Update | - |
| article html file updated | 4 July 2016 06:20 CEST | Update | - |
| article html file updated | 31 May 2016 08:32 CEST | Original file | - |
| article xml uploaded. | 31 May 2016 08:31 CEST | Original file | https://www.mdpi.com/2218-1989/6/2/17/xml |
| article pdf uploaded. | 31 May 2016 08:31 CEST | Version of Record | https://www.mdpi.com/2218-1989/6/2/17/pdf |
