| article html file updated | 6 February 2020 16:25 CET | Update | https://www.mdpi.com/1999-4907/6/3/670 |
| article html file updated | 7 May 2019 00:09 CEST | Update | - |
| article html file updated | 25 March 2019 22:37 CET | Update | - |
| article html file updated | 21 August 2015 08:26 CEST | Original file | - |
| article pdf uploaded. | 9 March 2015 11:52 CET | Version of Record | https://www.mdpi.com/1999-4907/6/3/670/pdf |
