| article html file updated | 6 February 2020 00:57 CET | Update | https://www.mdpi.com/1996-1073/6/3/1669 |
| article html file updated | 8 May 2019 07:29 CEST | Update | - |
| article html file updated | 20 March 2019 19:40 CET | Update | - |
| article html file updated | 14 February 2017 11:30 CET | Original file | - |
| article pdf uploaded. | 11 March 2013 16:32 CET | Version of Record | https://www.mdpi.com/1996-1073/6/3/1669/pdf |
