| article html file updated | 7 February 2020 21:33 CET | Update | https://www.mdpi.com/1999-4923/9/1/7 |
| article html file updated | 22 September 2019 21:52 CEST | Update | - |
| article html file updated | 4 May 2019 15:06 CEST | Update | - |
| article html file updated | 31 March 2017 05:35 CEST | Update | - |
| article html file updated | 16 January 2017 11:42 CET | Original file | - |
| article xml uploaded. | 16 January 2017 11:40 CET | Original file | https://www.mdpi.com/1999-4923/9/1/7/xml |
| article pdf uploaded. | 16 January 2017 11:40 CET | Version of Record | https://www.mdpi.com/1999-4923/9/1/7/pdf |
