| article html file updated | 6 February 2020 11:45 CET | Update | https://www.mdpi.com/2073-4441/6/9/2539 |
| article html file updated | 7 May 2019 09:10 CEST | Update | N/A |
| article html file updated | 21 March 2019 23:45 CET | Update | N/A |
| article html file updated | 20 August 2015 16:29 CEST | Original file | N/A |
| article pdf uploaded. | 28 August 2014 14:01 CEST | Updated version of record | https://www.mdpi.com/2073-4441/6/9/2539/pdf |
| article pdf uploaded. | 25 August 2014 14:48 CEST | Version of Record | https://www.mdpi.com/2073-4441/6/9/2539/pdf-vor |
