| article html file updated | 7 February 2020 06:59 CET | Update | https://www.mdpi.com/2073-4352/6/4/40 |
| article html file updated | 5 May 2019 19:16 CEST | Update | - |
| article html file updated | 27 March 2019 01:19 CET | Update | - |
| article html file updated | 27 April 2016 11:05 CEST | Update | - |
| article html file updated | 8 April 2016 08:41 CEST | Original file | - |
| article xml uploaded. | 8 April 2016 08:40 CEST | Original file | https://www.mdpi.com/2073-4352/6/4/40/xml |
| article pdf uploaded. | 8 April 2016 08:40 CEST | Version of Record | https://www.mdpi.com/2073-4352/6/4/40/pdf |
