| article html file updated | 14 August 2026 18:08 CEST | Update | https://www.mdpi.com/2227-7072/5/4/21 |
| article html file updated | 30 August 2025 01:23 CEST | Update | N/A |
| article html file updated | 16 July 2022 06:44 CEST | Update | N/A |
| article html file updated | 8 February 2020 18:10 CET | Update | N/A |
| article html file updated | 2 May 2019 21:56 CEST | Update | N/A |
| article html file updated | 2 January 2018 13:28 CET | Update | N/A |
| article html file updated | 12 October 2017 13:27 CEST | Original file | N/A |
| article xml uploaded. | 12 October 2017 13:26 CEST | Original file | https://www.mdpi.com/2227-7072/5/4/21/xml |
| article pdf uploaded. | 12 October 2017 13:26 CEST | Updated version of record | https://www.mdpi.com/2227-7072/5/4/21/pdf |
| article pdf uploaded. | 11 October 2017 15:15 CEST | Version of Record | https://www.mdpi.com/2227-7072/5/4/21/pdf-vor |
