| article html file updated | 7 February 2020 07:12 CET | Update | https://www.mdpi.com/2073-4344/6/4/57 |
| article html file updated | 5 May 2019 18:45 CEST | Update | - |
| article html file updated | 27 March 2019 01:46 CET | Update | - |
| article html file updated | 27 April 2016 11:02 CEST | Update | - |
| article html file updated | 13 April 2016 12:02 CEST | Original file | - |
| article xml uploaded. | 13 April 2016 12:01 CEST | Update | https://www.mdpi.com/2073-4344/6/4/57/xml |
| article pdf uploaded. | 13 April 2016 12:01 CEST | Version of Record | https://www.mdpi.com/2073-4344/6/4/57/pdf |
