| article html file updated | 6 February 2020 00:19 CET | Update | https://www.mdpi.com/1996-1944/6/2/421 |
| article html file updated | 8 May 2019 09:02 CEST | Update | N/A |
| article html file updated | 20 March 2019 18:02 CET | Original file | N/A |
| article pdf uploaded. | 31 January 2013 14:30 CET | Updated version of record | https://www.mdpi.com/1996-1944/6/2/421/pdf |
| article pdf uploaded. | 31 January 2013 09:39 CET | Version of Record | https://www.mdpi.com/1996-1944/6/2/421/pdf-vor |
