| article html file updated | 7 February 2020 10:13 CET | Update | https://www.mdpi.com/1996-1073/9/6/457 |
| article html file updated | 5 May 2019 12:52 CEST | Update | - |
| article html file updated | 27 March 2019 07:34 CET | Update | - |
| article html file updated | 28 June 2016 09:34 CEST | Update | - |
| article html file updated | 15 June 2016 14:55 CEST | Original file | - |
| article xml uploaded. | 15 June 2016 14:54 CEST | Update | https://www.mdpi.com/1996-1073/9/6/457/xml |
| article pdf uploaded. | 15 June 2016 14:54 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/457/pdf |
