| article html file updated | 7 February 2020 02:55 CET | Update | https://www.mdpi.com/2227-7080/4/1/2 |
| article html file updated | 6 May 2019 03:33 CEST | Update | N/A |
| article html file updated | 26 March 2019 17:33 CET | Original file | N/A |
| article pdf uploaded. | 31 December 2015 14:00 CET | Version of Record | https://www.mdpi.com/2227-7080/4/1/2/pdf |
| article xml uploaded. | 31 December 2015 14:00 CET | Original file | https://www.mdpi.com/2227-7080/4/1/2/xml |
