| article html file updated | 6 February 2020 16:39 CET | Update | https://www.mdpi.com/1999-4907/6/3/708 |
| article html file updated | 6 May 2019 23:43 CEST | Update | N/A |
| article html file updated | 25 March 2019 23:00 CET | Update | N/A |
| article html file updated | 21 August 2015 08:49 CEST | Original file | N/A |
| article pdf uploaded. | 16 March 2015 11:49 CET | Version of Record | https://www.mdpi.com/1999-4907/6/3/708/pdf |
