| article html file updated | 7 February 2020 09:14 CET | Update | https://www.mdpi.com/1996-1073/9/6/408 |
| article html file updated | 5 May 2019 14:47 CEST | Update | - |
| article html file updated | 27 March 2019 05:40 CET | Update | - |
| article html file updated | 28 June 2016 09:25 CEST | Update | - |
| article html file updated | 25 May 2016 10:24 CEST | Original file | - |
| article xml uploaded. | 25 May 2016 10:22 CEST | Original file | https://www.mdpi.com/1996-1073/9/6/408/xml |
| article pdf uploaded. | 25 May 2016 10:22 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/408/pdf |
