| article html file updated | 6 February 2020 07:49 CET | Update | https://www.mdpi.com/2227-9059/2/1/110 |
| article html file updated | 7 May 2019 17:30 CEST | Update | - |
| article html file updated | 21 March 2019 13:40 CET | Update | - |
| article html file updated | 23 February 2017 02:21 CET | Update | - |
| article html file updated | 19 August 2015 23:14 CEST | Original file | - |
| article pdf uploaded. | 12 March 2014 12:05 CET | Updated version of record | https://www.mdpi.com/2227-9059/2/1/110/pdf |
| article pdf uploaded. | 10 March 2014 11:48 CET | Version of Record | https://www.mdpi.com/2227-9059/2/1/110/pdf-vor |
