| article html file updated | 6 February 2020 18:59 CET | Update | https://www.mdpi.com/1996-1073/8/6/4697 |
| article html file updated | 6 May 2019 19:15 CEST | Update | N/A |
| article html file updated | 26 March 2019 03:23 CET | Update | N/A |
| article html file updated | 21 August 2015 12:36 CEST | Original file | N/A |
| article pdf uploaded. | 26 May 2015 12:50 CEST | Version of Record | https://www.mdpi.com/1996-1073/8/6/4697/pdf |
