| article html file updated | 31 August 2025 05:38 CEST | Update | https://www.mdpi.com/2413-8851/3/4/109 |
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| article pdf uploaded. | 19 December 2019 04:51 CET | Updated version of record | https://www.mdpi.com/2413-8851/3/4/109/pdf |
| article xml uploaded. | 19 December 2019 04:51 CET | Update | https://www.mdpi.com/2413-8851/3/4/109/xml |
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| article pdf uploaded. | 3 December 2019 14:54 CET | Version of Record | https://www.mdpi.com/2413-8851/3/4/109/pdf-vor |
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