| article html file updated | 6 February 2020 09:10 CET | Update | https://www.mdpi.com/2304-6732/1/2/131 |
| article html file updated | 7 May 2019 14:42 CEST | Update | - |
| article html file updated | 21 March 2019 16:52 CET | Update | - |
| article html file updated | 20 August 2015 06:30 CEST | Original file | - |
| article pdf uploaded. | 13 May 2014 11:23 CEST | Updated version of record | https://www.mdpi.com/2304-6732/1/2/131/pdf |
| article pdf uploaded. | 12 May 2014 10:52 CEST | Version of Record | https://www.mdpi.com/2304-6732/1/2/131/pdf-vor |
