| article html file updated | 6 February 2020 04:41 CET | Update | https://www.mdpi.com/2077-0375/3/4/266 |
| article html file updated | 7 May 2019 23:46 CEST | Update | - |
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| article xml file uploaded | 18 March 2014 09:52 CET | Original file | https://www.mdpi.com/2077-0375/3/4/266/xml |
| article pdf uploaded. | 30 September 2013 18:06 CEST | Version of Record | https://www.mdpi.com/2077-0375/3/4/266/pdf |
