| article html file updated | 6 February 2020 14:14 CET | Update | https://www.mdpi.com/2075-4663/2/4/131 |
| article html file updated | 20 September 2019 15:43 CEST | Update | - |
| article html file updated | 7 May 2019 04:25 CEST | Update | - |
| article html file updated | 25 March 2019 18:51 CET | Update | - |
| article html file updated | 21 August 2015 03:34 CEST | Original file | - |
| article pdf uploaded. | 8 December 2014 10:00 CET | Updated version of record | https://www.mdpi.com/2075-4663/2/4/131/pdf |
| article pdf uploaded. | 5 December 2014 14:29 CET | Version of Record | https://www.mdpi.com/2075-4663/2/4/131/pdf-vor |
