| article html file updated | 7 February 2020 18:50 CET | Update | https://www.mdpi.com/2227-9067/3/4/39 |
| article html file updated | 22 September 2019 07:50 CEST | Update | N/A |
| article html file updated | 4 May 2019 20:53 CEST | Update | N/A |
| article html file updated | 27 December 2016 02:27 CET | Update | N/A |
| article html file updated | 30 November 2016 11:26 CET | Original file | N/A |
| article xml uploaded. | 30 November 2016 11:25 CET | Original file | https://www.mdpi.com/2227-9067/3/4/39/xml |
| article pdf uploaded. | 30 November 2016 11:25 CET | Version of Record | https://www.mdpi.com/2227-9067/3/4/39/pdf |
