| article html file updated | 7 February 2020 20:00 CET | Update | https://www.mdpi.com/2218-2004/4/4/30 |
| article html file updated | 22 September 2019 13:36 CEST | Update | N/A |
| article html file updated | 4 May 2019 18:25 CEST | Update | N/A |
| article html file updated | 29 December 2016 04:31 CET | Update | N/A |
| article html file updated | 20 December 2016 12:58 CET | Original file | N/A |
| article xml uploaded. | 20 December 2016 12:57 CET | Original file | https://www.mdpi.com/2218-2004/4/4/30/xml |
| article pdf uploaded. | 20 December 2016 12:57 CET | Version of Record | https://www.mdpi.com/2218-2004/4/4/30/pdf |
