| article html file updated | 31 August 2025 10:53 CEST | Update | https://www.mdpi.com/2218-1997/6/2/29 |
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| article pdf uploaded. | 29 February 2020 06:21 CET | Updated version of record | https://www.mdpi.com/2218-1997/6/2/29/pdf |
| article xml uploaded. | 29 February 2020 06:21 CET | Update | https://www.mdpi.com/2218-1997/6/2/29/xml |
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| article pdf uploaded. | 6 February 2020 12:13 CET | Version of Record | https://www.mdpi.com/2218-1997/6/2/29/pdf-vor |
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