| article html file updated | 7 February 2020 17:41 CET | Update | https://www.mdpi.com/2308-3425/3/4/31 |
| article html file updated | 4 May 2019 23:08 CEST | Update | - |
| article html file updated | 2 December 2016 02:52 CET | Original file | - |
| article xml uploaded. | 2 December 2016 02:34 CET | Update | https://www.mdpi.com/2308-3425/3/4/31/xml |
| article xml uploaded. | 2 December 2016 02:34 CET | Original file | - |
| article pdf uploaded. | 8 November 2016 12:11 CET | Version of Record | https://www.mdpi.com/2308-3425/3/4/31/pdf |
