| article html file updated | 6 February 2020 08:02 CET | Update | https://www.mdpi.com/1999-4907/5/3/439 |
| article html file updated | 20 September 2019 06:42 CEST | Update | - |
| article html file updated | 7 May 2019 17:03 CEST | Update | - |
| article html file updated | 21 March 2019 14:11 CET | Update | - |
| article html file updated | 20 August 2015 00:31 CEST | Original file | - |
| article pdf uploaded. | 20 March 2014 11:46 CET | Version of Record | https://www.mdpi.com/1999-4907/5/3/439/pdf |
