| article html file updated | 31 August 2025 06:50 CEST | Update | https://www.mdpi.com/1996-1073/13/1/6 |
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| article pdf uploaded. | 23 December 2019 14:10 CET | Updated version of record | https://www.mdpi.com/1996-1073/13/1/6/pdf |
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| article pdf uploaded. | 18 December 2019 08:57 CET | Version of Record | https://www.mdpi.com/1996-1073/13/1/6/pdf-vor |
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