| article html file updated | 31 August 2025 06:54 CEST | Update | https://www.mdpi.com/2227-7390/8/1/7 |
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| article pdf uploaded. | 30 December 2019 11:32 CET | Updated version of record | https://www.mdpi.com/2227-7390/8/1/7/pdf |
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| article pdf uploaded. | 18 December 2019 16:07 CET | Version of Record | https://www.mdpi.com/2227-7390/8/1/7/pdf-vor |
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