| article html file updated | 7 February 2020 03:24 CET | Update | https://www.mdpi.com/1996-1073/9/1/43 |
| article html file updated | 6 May 2019 02:38 CEST | Update | N/A |
| article html file updated | 26 March 2019 18:23 CET | Original file | N/A |
| article pdf uploaded. | 14 January 2016 08:51 CET | Version of Record | https://www.mdpi.com/1996-1073/9/1/43/pdf |
| article xml uploaded. | 14 January 2016 08:51 CET | Original file | https://www.mdpi.com/1996-1073/9/1/43/xml |
