| article html file updated | 7 February 2020 07:39 CET | Update | https://www.mdpi.com/1996-1073/9/4/307 |
| article html file updated | 5 May 2019 17:52 CEST | Update | - |
| article html file updated | 27 March 2019 02:40 CET | Update | - |
| article html file updated | 28 April 2016 08:09 CEST | Update | - |
| article html file updated | 22 April 2016 11:23 CEST | Original file | - |
| article xml uploaded. | 22 April 2016 11:20 CEST | Original file | https://www.mdpi.com/1996-1073/9/4/307/xml |
| article pdf uploaded. | 22 April 2016 11:20 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/4/307/pdf |
