| article html file updated | 6 February 2020 00:51 CET | Update | https://www.mdpi.com/2071-1050/5/3/997 |
| article html file updated | 19 September 2019 18:33 CEST | Update | - |
| article html file updated | 8 May 2019 07:41 CEST | Update | - |
| article html file updated | 20 March 2019 19:24 CET | Original file | - |
| article pdf uploaded. | 12 March 2013 16:49 CET | Updated version of record | https://www.mdpi.com/2071-1050/5/3/997/pdf |
| article pdf uploaded. | 6 March 2013 13:20 CET | Version of Record | https://www.mdpi.com/2071-1050/5/3/997/pdf-vor |
