| article html file updated | 31 August 2025 09:55 CEST | Update | https://www.mdpi.com/2218-1997/6/2/21 |
| article html file updated | 20 July 2022 18:26 CEST | Update | - |
| article html file updated | 28 February 2020 12:10 CET | Original file | - |
| article pdf uploaded. | 28 February 2020 12:09 CET | Updated version of record | https://www.mdpi.com/2218-1997/6/2/21/pdf |
| article xml uploaded. | 28 February 2020 12:09 CET | Update | https://www.mdpi.com/2218-1997/6/2/21/xml |
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| article pdf uploaded. | 24 January 2020 14:05 CET | Version of Record | https://www.mdpi.com/2218-1997/6/2/21/pdf-vor |
| article xml file uploaded | 24 January 2020 14:05 CET | Original file | - |
