| article html file updated | 2 September 2025 03:21 CEST | Update | https://www.mdpi.com/2306-5729/6/4/40 | 
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| article pdf uploaded. | 10 April 2021 10:53 CEST | Version of Record | https://www.mdpi.com/2306-5729/6/4/40/pdf | 
| article xml uploaded. | 10 April 2021 10:53 CEST | Update | https://www.mdpi.com/2306-5729/6/4/40/xml | 
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