| article html file updated | 7 February 2020 19:21 CET | Update | https://www.mdpi.com/2226-4310/3/4/44 |
| article html file updated | 4 May 2019 19:49 CEST | Update | - |
| article html file updated | 28 December 2016 11:32 CET | Update | - |
| article html file updated | 9 December 2016 10:41 CET | Original file | - |
| article xml uploaded. | 9 December 2016 10:39 CET | Original file | https://www.mdpi.com/2226-4310/3/4/44/xml |
| article pdf uploaded. | 9 December 2016 10:39 CET | Version of Record | https://www.mdpi.com/2226-4310/3/4/44/pdf |
