| article html file updated | 30 August 2025 00:04 CEST | Update | https://www.mdpi.com/2079-9721/4/4/40 |
| article html file updated | 16 July 2022 04:12 CEST | Update | N/A |
| article html file updated | 7 February 2020 19:50 CET | Update | N/A |
| article html file updated | 22 September 2019 12:41 CEST | Update | N/A |
| article html file updated | 4 May 2019 18:45 CEST | Update | N/A |
| article html file updated | 17 December 2016 06:55 CET | Original file | N/A |
| article xml uploaded. | 17 December 2016 06:54 CET | Original file | https://www.mdpi.com/2079-9721/4/4/40/xml |
| article pdf uploaded. | 17 December 2016 06:54 CET | Version of Record | https://www.mdpi.com/2079-9721/4/4/40/pdf |