| article html file updated | 7 February 2020 01:48 CET | Update | https://www.mdpi.com/2227-9059/3/4/304 |
| article html file updated | 6 May 2019 05:52 CEST | Update | - |
| article html file updated | 26 March 2019 15:48 CET | Update | - |
| article html file updated | 21 February 2017 08:41 CET | Original file | - |
| article pdf uploaded. | 4 December 2015 16:27 CET | Version of Record | https://www.mdpi.com/2227-9059/3/4/304/pdf |
| article xml uploaded. | 4 December 2015 16:27 CET | Original file | https://www.mdpi.com/2227-9059/3/4/304/xml |
