| article html file updated | 8 February 2020 04:50 CET | Update | https://www.mdpi.com/2079-9268/7/2/9 |
| article html file updated | 24 September 2019 14:38 CEST | Update | N/A |
| article html file updated | 3 May 2019 23:55 CEST | Update | N/A |
| article html file updated | 23 May 2017 03:29 CEST | Update | N/A |
| article html file updated | 4 May 2017 13:21 CEST | Original file | N/A |
| article xml uploaded. | 4 May 2017 13:19 CEST | Update | https://www.mdpi.com/2079-9268/7/2/9/xml |
| article pdf uploaded. | 4 May 2017 13:19 CEST | Updated version of record | https://www.mdpi.com/2079-9268/7/2/9/pdf |
| article pdf uploaded. | 1 May 2017 09:26 CEST | Version of Record | https://www.mdpi.com/2079-9268/7/2/9/pdf-vor |
