| article html file updated | 6 February 2020 07:44 CET | Update | https://www.mdpi.com/2073-4360/6/3/651 |
| article html file updated | 7 May 2019 17:40 CEST | Update | - |
| article html file updated | 21 March 2019 13:29 CET | Update | - |
| article html file updated | 19 August 2015 22:49 CEST | Original file | - |
| article pdf uploaded. | 7 March 2014 16:19 CET | Updated version of record | https://www.mdpi.com/2073-4360/6/3/651/pdf |
| article pdf uploaded. | 6 March 2014 11:54 CET | Version of Record | https://www.mdpi.com/2073-4360/6/3/651/pdf-vor |
