| article html file updated | 6 February 2020 15:00 CET | Update | https://www.mdpi.com/2223-7747/4/1/27 |
| article html file updated | 7 May 2019 02:50 CEST | Update | - |
| article html file updated | 25 March 2019 20:11 CET | Update | - |
| article html file updated | 12 October 2015 10:32 CEST | Update | - |
| article xml file uploaded | 12 October 2015 10:32 CEST | Update | https://www.mdpi.com/2223-7747/4/1/27/xml |
| article html file updated | 21 August 2015 05:25 CEST | Update | - |
| article html file updated | 20 January 2015 08:36 CET | Original file | - |
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| article pdf uploaded. | 8 January 2015 10:43 CET | Version of Record | https://www.mdpi.com/2223-7747/4/1/27/pdf |
