| article html file updated | 7 February 2020 09:19 CET | Update | https://www.mdpi.com/1996-1073/9/6/411 |
| article html file updated | 5 May 2019 14:36 CEST | Update | - |
| article html file updated | 27 March 2019 05:50 CET | Update | - |
| article html file updated | 28 June 2016 09:26 CEST | Update | - |
| article html file updated | 26 May 2016 10:58 CEST | Original file | - |
| article xml uploaded. | 26 May 2016 10:56 CEST | Original file | https://www.mdpi.com/1996-1073/9/6/411/xml |
| article pdf uploaded. | 26 May 2016 10:56 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/411/pdf |
