| article html file updated | 6 February 2020 06:17 CET | Update | https://www.mdpi.com/1999-4893/6/4/871 |
| article html file updated | 7 May 2019 20:43 CEST | Update | - |
| article html file updated | 21 March 2019 09:40 CET | Update | - |
| article html file updated | 15 February 2017 07:02 CET | Original file | - |
| article pdf uploaded. | 17 December 2013 14:31 CET | Version of Record | https://www.mdpi.com/1999-4893/6/4/871/pdf |
