| article html file updated | 31 August 2025 07:14 CEST | Update | https://www.mdpi.com/2227-9032/8/1/4 |
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| article pdf uploaded. | 30 December 2019 10:36 CET | Updated version of record | https://www.mdpi.com/2227-9032/8/1/4/pdf |
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| article pdf uploaded. | 22 December 2019 11:12 CET | Version of Record | https://www.mdpi.com/2227-9032/8/1/4/pdf-vor |
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