| article html file updated | 7 February 2020 04:54 CET | Update | https://www.mdpi.com/2227-7080/4/1/7 |
| article html file updated | 5 May 2019 23:33 CEST | Update | - |
| article html file updated | 26 March 2019 21:26 CET | Original file | - |
| article pdf uploaded. | 23 February 2016 11:13 CET | Version of Record | https://www.mdpi.com/2227-7080/4/1/7/pdf |
| article xml uploaded. | 23 February 2016 11:13 CET | Original file | https://www.mdpi.com/2227-7080/4/1/7/xml |
