| article html file updated | 7 February 2020 03:09 CET | Update | https://www.mdpi.com/2218-273X/6/1/9 |
| article html file updated | 6 May 2019 03:06 CEST | Update | - |
| article html file updated | 26 March 2019 17:55 CET | Update | - |
| article html file updated | 28 March 2016 11:38 CEST | Original file | - |
| article pdf uploaded. | 7 January 2016 16:06 CET | Version of Record | https://www.mdpi.com/2218-273X/6/1/9/pdf |
| article xml uploaded. | 7 January 2016 16:06 CET | Original file | https://www.mdpi.com/2218-273X/6/1/9/xml |
