| article html file updated | 6 February 2020 06:06 CET | Update | https://www.mdpi.com/1996-1073/6/12/6413 |
| article html file updated | 7 May 2019 21:02 CEST | Update | N/A |
| article html file updated | 21 March 2019 09:09 CET | Update | N/A |
| article html file updated | 14 February 2017 11:38 CET | Original file | N/A |
| article pdf uploaded. | 10 December 2013 16:16 CET | Version of Record | https://www.mdpi.com/1996-1073/6/12/6413/pdf |
