| article html file updated | 7 February 2020 21:06 CET | Update | https://www.mdpi.com/2227-7102/7/1/14 |
| article html file updated | 4 May 2019 16:06 CEST | Update | - |
| article html file updated | 27 October 2017 09:54 CEST | Update | - |
| article html file updated | 11 January 2017 12:53 CET | Original file | - |
| article pdf uploaded. | 10 January 2017 15:41 CET | Version of Record | https://www.mdpi.com/2227-7102/7/1/14/pdf |
