| article html file updated | 7 February 2020 19:41 CET | Update | https://www.mdpi.com/2076-3387/6/4/20 |
| article html file updated | 22 September 2019 11:56 CEST | Update | N/A |
| article html file updated | 4 May 2019 19:02 CEST | Update | N/A |
| article html file updated | 27 October 2017 09:19 CEST | Update | N/A |
| article html file updated | 15 December 2016 16:08 CET | Original file | N/A |
| article xml uploaded. | 15 December 2016 16:06 CET | Original file | https://www.mdpi.com/2076-3387/6/4/20/xml |
| article pdf uploaded. | 15 December 2016 16:06 CET | Version of Record | https://www.mdpi.com/2076-3387/6/4/20/pdf |
