| article html file updated | 6 February 2020 06:05 CET | Update | https://www.mdpi.com/2077-0375/3/4/415 |
| article html file updated | 7 May 2019 21:03 CEST | Update | - |
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| article html file updated | 19 August 2015 13:10 CEST | Update | - |
| article html file updated | 18 March 2014 09:53 CET | Original file | - |
| article xml file uploaded | 18 March 2014 09:53 CET | Original file | https://www.mdpi.com/2077-0375/3/4/415/xml |
| article pdf uploaded. | 10 December 2013 15:20 CET | Version of Record | https://www.mdpi.com/2077-0375/3/4/415/pdf |
