| article html file updated | 31 August 2025 18:33 CEST | Update | https://www.mdpi.com/2224-2708/9/2/21 |
| article html file updated | 21 July 2022 02:59 CEST | Update | N/A |
| article html file updated | 25 April 2020 12:28 CEST | Original file | N/A |
| article pdf uploaded. | 25 April 2020 12:27 CEST | Updated version of record | https://www.mdpi.com/2224-2708/9/2/21/pdf |
| article xml uploaded. | 25 April 2020 12:27 CEST | Update | https://www.mdpi.com/2224-2708/9/2/21/xml |
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