| article html file updated | 7 February 2020 04:30 CET | Update | https://www.mdpi.com/1996-1944/9/2/109 |
| article html file updated | 6 May 2019 00:29 CEST | Update | - |
| article html file updated | 26 March 2019 20:36 CET | Original file | - |
| article pdf uploaded. | 17 February 2016 05:02 CET | Updated version of record | https://www.mdpi.com/1996-1944/9/2/109/pdf |
| article xml uploaded. | 17 February 2016 05:02 CET | Original file | https://www.mdpi.com/1996-1944/9/2/109/xml |
| article pdf uploaded. | 11 February 2016 08:04 CET | Version of Record | https://www.mdpi.com/1996-1944/9/2/109/pdf-vor |
