| article html file updated | 31 August 2025 06:56 CEST | Update | https://www.mdpi.com/1996-1944/13/1/21 |
| article html file updated | 19 July 2022 21:20 CEST | Update | - |
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| article html file updated | 24 December 2019 15:40 CET | Original file | - |
| article pdf uploaded. | 24 December 2019 15:39 CET | Updated version of record | https://www.mdpi.com/1996-1944/13/1/21/pdf |
| article xml uploaded. | 24 December 2019 15:39 CET | Update | https://www.mdpi.com/1996-1944/13/1/21/xml |
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| article pdf uploaded. | 19 December 2019 10:07 CET | Version of Record | https://www.mdpi.com/1996-1944/13/1/21/pdf-vor |
| article xml file uploaded | 19 December 2019 10:07 CET | Original file | - |
