| article html file updated | 6 February 2020 17:03 CET | Update | https://www.mdpi.com/1996-1073/8/4/2454 |
| article html file updated | 6 May 2019 22:59 CEST | Update | - |
| article html file updated | 25 March 2019 23:42 CET | Update | - |
| article html file updated | 21 August 2015 09:31 CEST | Original file | - |
| article pdf uploaded. | 27 March 2015 10:04 CET | Version of Record | https://www.mdpi.com/1996-1073/8/4/2454/pdf |
