| article html file updated | 6 February 2020 06:16 CET | Update | https://www.mdpi.com/2075-1729/3/4/538 |
| article html file updated | 7 May 2019 20:43 CEST | Update | - |
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| article html file updated | 19 August 2015 14:06 CEST | Update | - |
| article html file updated | 24 July 2014 10:35 CEST | Original file | - |
| article xml file uploaded | 24 July 2014 10:35 CEST | Original file | https://www.mdpi.com/2075-1729/3/4/538/xml |
| article pdf uploaded. | 17 December 2013 14:02 CET | Version of Record | https://www.mdpi.com/2075-1729/3/4/538/pdf |
