| article html file updated | 6 February 2020 16:17 CET | Update | https://www.mdpi.com/1999-4907/6/3/636 |
| article html file updated | 7 May 2019 00:21 CEST | Update | - |
| article html file updated | 25 March 2019 22:23 CET | Update | - |
| article html file updated | 21 August 2015 08:12 CEST | Original file | - |
| article pdf uploaded. | 4 March 2015 09:24 CET | Version of Record | https://www.mdpi.com/1999-4907/6/3/636/pdf |
