| article html file updated | 8 February 2020 17:12 CET | Update | https://www.mdpi.com/2076-3921/6/4/74 |
| article html file updated | 27 September 2019 09:20 CEST | Update | N/A |
| article html file updated | 2 May 2019 23:59 CEST | Update | N/A |
| article html file updated | 2 January 2018 20:31 CET | Update | N/A |
| article html file updated | 26 September 2017 15:03 CEST | Original file | N/A |
| article xml uploaded. | 26 September 2017 15:02 CEST | Original file | https://www.mdpi.com/2076-3921/6/4/74/xml |
| article pdf uploaded. | 26 September 2017 15:02 CEST | Version of Record | https://www.mdpi.com/2076-3921/6/4/74/pdf |
