| article html file updated | 7 February 2020 03:17 CET | Update | https://www.mdpi.com/1996-1073/9/1/39 |
| article html file updated | 6 May 2019 02:51 CEST | Update | N/A |
| article html file updated | 26 March 2019 18:10 CET | Original file | N/A |
| article pdf uploaded. | 12 January 2016 13:29 CET | Version of Record | https://www.mdpi.com/1996-1073/9/1/39/pdf |
| article xml uploaded. | 12 January 2016 13:29 CET | Original file | https://www.mdpi.com/1996-1073/9/1/39/xml |
