| article html file updated | 7 February 2020 06:38 CET | Update | https://www.mdpi.com/2227-9709/3/2/4 |
| article html file updated | 5 May 2019 19:58 CEST | Update | - |
| article html file updated | 27 March 2019 00:42 CET | Update | - |
| article html file updated | 30 October 2017 08:33 CET | Update | - |
| article html file updated | 27 October 2017 10:22 CEST | Update | - |
| article html file updated | 30 March 2016 13:45 CEST | Original file | - |
| article xml uploaded. | 30 March 2016 13:44 CEST | Original file | https://www.mdpi.com/2227-9709/3/2/4/xml |
| article pdf uploaded. | 30 March 2016 13:44 CEST | Version of Record | https://www.mdpi.com/2227-9709/3/2/4/pdf |
