| article html file updated | 29 August 2025 20:55 CEST | Update | https://www.mdpi.com/2218-1989/4/1/53 |
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| article xml file uploaded | 12 May 2014 15:28 CEST | Original file | https://www.mdpi.com/2218-1989/4/1/53/xml |
| article pdf uploaded. | 27 January 2014 10:48 CET | Updated version of record | https://www.mdpi.com/2218-1989/4/1/53/pdf |
| article pdf uploaded. | 7 January 2014 15:35 CET | Version of Record | https://www.mdpi.com/2218-1989/4/1/53/pdf-vor |
