| article html file updated | 7 February 2020 05:34 CET | Update | https://www.mdpi.com/1996-1073/9/3/172 |
| article html file updated | 21 September 2019 12:40 CEST | Update | - |
| article html file updated | 5 May 2019 22:10 CEST | Update | - |
| article html file updated | 26 March 2019 22:49 CET | Update | - |
| article html file updated | 30 March 2016 12:14 CEST | Original file | - |
| article pdf uploaded. | 8 March 2016 11:11 CET | Version of Record | https://www.mdpi.com/1996-1073/9/3/172/pdf |
| article xml uploaded. | 8 March 2016 11:11 CET | Original file | https://www.mdpi.com/1996-1073/9/3/172/xml |
