| article html file updated | 7 February 2020 06:23 CET | Update | https://www.mdpi.com/1996-1073/9/4/239 |
| article html file updated | 5 May 2019 20:28 CEST | Update | - |
| article html file updated | 27 March 2019 00:17 CET | Update | - |
| article html file updated | 28 April 2016 07:49 CEST | Update | - |
| article html file updated | 25 March 2016 09:20 CET | Original file | - |
| article xml uploaded. | 25 March 2016 09:18 CET | Update | https://www.mdpi.com/1996-1073/9/4/239/xml |
| article pdf uploaded. | 25 March 2016 09:18 CET | Version of Record | https://www.mdpi.com/1996-1073/9/4/239/pdf |
