| article html file updated | 8 February 2020 21:13 CET | Update | https://www.mdpi.com/2227-9709/4/4/40 |
| article html file updated | 2 May 2019 14:57 CEST | Update | N/A |
| article html file updated | 2 January 2018 12:47 CET | Update | N/A |
| article html file updated | 15 November 2017 08:40 CET | Original file | N/A |
| article xml uploaded. | 15 November 2017 08:38 CET | Update | https://www.mdpi.com/2227-9709/4/4/40/xml |
| article xml uploaded. | 15 November 2017 08:38 CET | Original file | N/A |
| article pdf uploaded. | 15 November 2017 08:38 CET | Version of Record | https://www.mdpi.com/2227-9709/4/4/40/pdf |
