| article html file updated | 8 February 2020 18:20 CET | Update | https://www.mdpi.com/2076-3921/6/4/77 |
| article html file updated | 27 September 2019 17:39 CEST | Update | N/A |
| article html file updated | 2 May 2019 21:33 CEST | Update | N/A |
| article html file updated | 2 January 2018 20:28 CET | Update | N/A |
| article html file updated | 13 October 2017 15:40 CEST | Original file | N/A |
| article xml uploaded. | 13 October 2017 15:39 CEST | Update | https://www.mdpi.com/2076-3921/6/4/77/xml |
| article xml uploaded. | 13 October 2017 15:39 CEST | Original file | N/A |
| article pdf uploaded. | 13 October 2017 15:39 CEST | Version of Record | https://www.mdpi.com/2076-3921/6/4/77/pdf |
