| article html file updated | 7 February 2020 16:42 CET | Update | https://www.mdpi.com/2076-3921/5/4/39 |
| article html file updated | 22 September 2019 03:30 CEST | Update | - |
| article html file updated | 5 May 2019 01:00 CEST | Update | - |
| article html file updated | 27 December 2016 11:55 CET | Update | - |
| article html file updated | 20 October 2016 11:35 CEST | Original file | - |
| article xml uploaded. | 20 October 2016 11:34 CEST | Original file | https://www.mdpi.com/2076-3921/5/4/39/xml |
| article pdf uploaded. | 20 October 2016 11:34 CEST | Version of Record | https://www.mdpi.com/2076-3921/5/4/39/pdf |
