| article html file updated | 6 February 2020 00:37 CET | Update | https://www.mdpi.com/1996-1944/6/2/580 |
| article html file updated | 8 May 2019 08:16 CEST | Update | - |
| article html file updated | 20 March 2019 18:47 CET | Update | - |
| article html file updated | 17 February 2017 06:47 CET | Original file | - |
| article pdf uploaded. | 21 February 2013 15:00 CET | Updated version of record | https://www.mdpi.com/1996-1944/6/2/580/pdf |
| article pdf uploaded. | 21 February 2013 08:44 CET | Version of Record | - |
