| article html file updated | 7 February 2020 02:04 CET | Update | https://www.mdpi.com/2310-2861/1/2/256 |
| article html file updated | 6 May 2019 05:19 CEST | Update | - |
| article html file updated | 26 March 2019 16:12 CET | Original file | - |
| article pdf uploaded. | 10 December 2015 11:59 CET | Version of Record | https://www.mdpi.com/2310-2861/1/2/256/pdf |
| article xml uploaded. | 10 December 2015 11:59 CET | Original file | https://www.mdpi.com/2310-2861/1/2/256/xml |
