| article html file updated | 6 February 2020 00:58 CET | Update | https://www.mdpi.com/1999-4923/5/1/168 |
| article html file updated | 19 September 2019 18:48 CEST | Update | N/A |
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| article xml file uploaded | 28 April 2014 11:05 CEST | Original file | https://www.mdpi.com/1999-4923/5/1/168/xml |
| article pdf uploaded. | 12 March 2013 15:41 CET | Version of Record | https://www.mdpi.com/1999-4923/5/1/168/pdf |