| article html file updated | 30 August 2025 21:25 CEST | Update | https://www.mdpi.com/2073-4409/8/6/621 |
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| article pdf uploaded. | 22 June 2019 05:52 CEST | Updated version of record | https://www.mdpi.com/2073-4409/8/6/621/pdf |
| article xml uploaded. | 22 June 2019 05:52 CEST | Update | https://www.mdpi.com/2073-4409/8/6/621/xml |
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| article pdf uploaded. | 20 June 2019 15:28 CEST | Version of Record | https://www.mdpi.com/2073-4409/8/6/621/pdf-vor |
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