| article html file updated | 7 February 2020 18:30 CET | Update | https://www.mdpi.com/2226-4310/3/4/40 |
| article html file updated | 4 May 2019 21:33 CEST | Update | - |
| article html file updated | 28 December 2016 11:30 CET | Update | - |
| article html file updated | 23 November 2016 12:40 CET | Original file | - |
| article xml uploaded. | 23 November 2016 12:39 CET | Original file | https://www.mdpi.com/2226-4310/3/4/40/xml |
| article pdf uploaded. | 23 November 2016 12:39 CET | Version of Record | https://www.mdpi.com/2226-4310/3/4/40/pdf |
