| article html file updated | 6 February 2020 02:08 CET | Update | https://www.mdpi.com/2227-7102/3/2/147 |
| article html file updated | 19 September 2019 20:50 CEST | Update | - |
| article html file updated | 8 May 2019 05:05 CEST | Update | - |
| article html file updated | 20 March 2019 22:37 CET | Update | - |
| article html file updated | 17 June 2015 09:24 CEST | Original file | - |
| article pdf uploaded. | 17 May 2013 13:24 CEST | Version of Record | https://www.mdpi.com/2227-7102/3/2/147/pdf |
