| article html file updated | 13 August 2026 10:59 CEST | Update | https://www.mdpi.com/2218-1989/5/1/56 |
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| article pdf uploaded. | 15 January 2015 10:30 CET | Updated version of record | https://www.mdpi.com/2218-1989/5/1/56/pdf |
| article pdf uploaded. | 14 January 2015 14:04 CET | Version of Record | https://www.mdpi.com/2218-1989/5/1/56/pdf-vor |
