| article html file updated | 6 February 2020 07:57 CET | Update | https://www.mdpi.com/1999-4907/5/3/404 |
| article html file updated | 7 May 2019 17:13 CEST | Update | N/A |
| article html file updated | 21 March 2019 14:00 CET | Update | N/A |
| article html file updated | 19 August 2015 23:58 CEST | Original file | N/A |
| article pdf uploaded. | 17 March 2014 15:28 CET | Version of Record | https://www.mdpi.com/1999-4907/5/3/404/pdf |
