| article html file updated | 7 February 2020 10:03 CET | Update | https://www.mdpi.com/1996-1073/9/6/450 |
| article html file updated | 5 May 2019 13:10 CEST | Update | - |
| article html file updated | 27 March 2019 07:17 CET | Update | - |
| article html file updated | 28 June 2016 09:33 CEST | Update | - |
| article html file updated | 14 June 2016 22:38 CEST | Original file | - |
| article xml uploaded. | 11 June 2016 10:54 CEST | Original file | https://www.mdpi.com/1996-1073/9/6/450/xml |
| article pdf uploaded. | 11 June 2016 10:54 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/450/pdf |
