| article html file updated | 7 February 2020 16:09 CET | Update | https://www.mdpi.com/2304-6775/4/4/31 |
| article html file updated | 22 September 2019 02:30 CEST | Update | N/A |
| article html file updated | 5 May 2019 02:01 CEST | Update | N/A |
| article html file updated | 30 December 2016 06:01 CET | Update | N/A |
| article html file updated | 11 October 2016 08:49 CEST | Original file | N/A |
| article xml uploaded. | 11 October 2016 08:48 CEST | Original file | https://www.mdpi.com/2304-6775/4/4/31/xml |
| article pdf uploaded. | 11 October 2016 08:48 CEST | Version of Record | https://www.mdpi.com/2304-6775/4/4/31/pdf |
