| article html file updated | 31 August 2025 06:54 CEST | Update | https://www.mdpi.com/2076-0817/9/1/4 |
| article html file updated | 19 July 2022 21:22 CEST | Update | - |
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| article html file updated | 24 December 2019 11:47 CET | Original file | - |
| article pdf uploaded. | 24 December 2019 11:45 CET | Updated version of record | https://www.mdpi.com/2076-0817/9/1/4/pdf |
| article xml uploaded. | 24 December 2019 11:45 CET | Update | https://www.mdpi.com/2076-0817/9/1/4/xml |
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| article pdf uploaded. | 18 December 2019 15:43 CET | Version of Record | https://www.mdpi.com/2076-0817/9/1/4/pdf-vor |
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