| article html file updated | 29 August 2025 22:41 CEST | Update | https://www.mdpi.com/2309-608X/2/1/9 |
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| article xml uploaded. | 8 December 2017 09:45 CET | Update | https://www.mdpi.com/2309-608X/2/1/9/xml |
| article pdf uploaded. | 5 February 2016 12:19 CET | Version of Record | https://www.mdpi.com/2309-608X/2/1/9/pdf |
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