| article html file updated | 7 February 2020 02:30 CET | Update | https://www.mdpi.com/2227-9091/3/4/624 |
| article html file updated | 6 May 2019 04:26 CEST | Update | - |
| article html file updated | 26 March 2019 16:54 CET | Original file | - |
| article pdf uploaded. | 21 December 2015 14:56 CET | Version of Record | https://www.mdpi.com/2227-9091/3/4/624/pdf |
| article xml uploaded. | 21 December 2015 14:56 CET | Original file | https://www.mdpi.com/2227-9091/3/4/624/xml |
