| article html file updated | 8 February 2020 18:27 CET | Update | https://www.mdpi.com/2076-3921/6/4/78 |
| article html file updated | 27 September 2019 18:26 CEST | Update | N/A |
| article html file updated | 2 May 2019 21:17 CEST | Update | N/A |
| article html file updated | 2 January 2018 20:28 CET | Update | N/A |
| article html file updated | 14 October 2017 22:51 CEST | Original file | N/A |
| article xml uploaded. | 14 October 2017 10:24 CEST | Original file | https://www.mdpi.com/2076-3921/6/4/78/xml |
| article pdf uploaded. | 14 October 2017 10:24 CEST | Version of Record | https://www.mdpi.com/2076-3921/6/4/78/pdf |
