| article html file updated | 6 February 2020 02:33 CET | Update | https://www.mdpi.com/2073-4433/4/2/169 |
| article html file updated | 8 May 2019 04:13 CEST | Update | - |
| article html file updated | 20 March 2019 23:37 CET | Update | - |
| article html file updated | 19 December 2016 11:29 CET | Original file | - |
| article pdf uploaded. | 10 June 2013 16:16 CEST | Updated version of record | https://www.mdpi.com/2073-4433/4/2/169/pdf |
| article pdf uploaded. | 7 June 2013 11:48 CEST | Version of Record | https://www.mdpi.com/2073-4433/4/2/169/pdf-vor |
