| article html file updated | 6 February 2020 16:37 CET | Update | https://www.mdpi.com/2073-431X/4/1/2 |
| article html file updated | 6 May 2019 23:45 CEST | Update | - |
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| article html file updated | 21 August 2015 08:48 CEST | Update | - |
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| article xml file uploaded | 15 May 2015 10:46 CEST | Original file | https://www.mdpi.com/2073-431X/4/1/2/xml |
| article pdf uploaded. | 13 March 2015 14:58 CET | Version of Record | https://www.mdpi.com/2073-431X/4/1/2/pdf |
