| article html file updated | 29 August 2025 23:48 CEST | Update | https://www.mdpi.com/2227-9067/3/4/21 |
| article html file updated | 20 August 2025 22:25 CEST | Update | N/A |
| article html file updated | 16 July 2022 03:40 CEST | Update | N/A |
| article html file updated | 7 February 2020 16:56 CET | Update | N/A |
| article html file updated | 22 September 2019 03:51 CEST | Update | N/A |
| article html file updated | 5 May 2019 00:33 CEST | Update | N/A |
| article html file updated | 27 December 2016 02:26 CET | Update | N/A |
| article html file updated | 25 October 2016 11:04 CEST | Original file | N/A |
| article xml uploaded. | 25 October 2016 11:03 CEST | Original file | https://www.mdpi.com/2227-9067/3/4/21/xml |
| article pdf uploaded. | 25 October 2016 11:03 CEST | Version of Record | https://www.mdpi.com/2227-9067/3/4/21/pdf |
