| article html file updated | 7 February 2020 02:48 CET | Update | https://www.mdpi.com/1996-1073/9/1/17 |
| article html file updated | 6 May 2019 03:45 CEST | Update | - |
| article html file updated | 26 March 2019 17:24 CET | Original file | - |
| article pdf uploaded. | 29 December 2015 12:38 CET | Version of Record | https://www.mdpi.com/1996-1073/9/1/17/pdf |
| article xml uploaded. | 29 December 2015 12:38 CET | Original file | https://www.mdpi.com/1996-1073/9/1/17/xml |
