| article html file updated | 7 February 2020 17:42 CET | Update | https://www.mdpi.com/1996-1073/9/11/921 |
| article html file updated | 4 May 2019 23:06 CEST | Update | - |
| article html file updated | 30 November 2016 05:52 CET | Update | - |
| article html file updated | 8 November 2016 12:46 CET | Original file | - |
| article xml uploaded. | 8 November 2016 12:44 CET | Update | https://www.mdpi.com/1996-1073/9/11/921/xml |
| article xml uploaded. | 8 November 2016 12:44 CET | Original file | - |
| article pdf uploaded. | 8 November 2016 12:44 CET | Version of Record | https://www.mdpi.com/1996-1073/9/11/921/pdf |
