| article html file updated | 6 February 2020 13:46 CET | Update | https://www.mdpi.com/1996-1073/7/11/7620 |
| article html file updated | 7 May 2019 05:16 CEST | Update | N/A |
| article html file updated | 25 March 2019 17:58 CET | Update | N/A |
| article html file updated | 21 August 2015 02:20 CEST | Original file | N/A |
| article pdf uploaded. | 19 November 2014 11:05 CET | Version of Record | https://www.mdpi.com/1996-1073/7/11/7620/pdf |
