| article html file updated | 6 February 2020 16:39 CET | Update | https://www.mdpi.com/2218-1997/1/1/24 |
| article html file updated | 20 September 2019 18:54 CEST | Update | N/A |
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| article html file updated | 11 November 2015 10:26 CET | Original file | N/A |
| article xml file uploaded | 11 November 2015 10:26 CET | Original file | https://www.mdpi.com/2218-1997/1/1/24/xml |
| article pdf uploaded. | 16 March 2015 14:12 CET | Version of Record | https://www.mdpi.com/2218-1997/1/1/24/pdf |
