| article html file updated | 6 February 2020 00:36 CET | Update | https://www.mdpi.com/2076-3387/3/1/4 |
| article html file updated | 19 September 2019 18:02 CEST | Update | - |
| article html file updated | 8 May 2019 08:18 CEST | Update | - |
| article html file updated | 20 March 2019 18:45 CET | Update | - |
| article html file updated | 17 June 2015 06:40 CEST | Original file | - |
| article pdf uploaded. | 21 February 2013 08:58 CET | Updated version of record | https://www.mdpi.com/2076-3387/3/1/4/pdf |
| article pdf uploaded. | 21 February 2013 08:57 CET | Updated version of record | - |
| article pdf uploaded. | 21 February 2013 08:51 CET | Updated version of record | - |
| article pdf uploaded. | 19 February 2013 13:58 CET | Version of Record | - |
