| article html file updated | 6 February 2020 12:59 CET | Update | https://www.mdpi.com/2073-8994/6/4/851 |
| article html file updated | 7 May 2019 06:49 CEST | Update | - |
| article html file updated | 22 March 2019 03:01 CET | Update | - |
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| article html file updated | 31 December 2014 03:31 CET | Original file | - |
| article xml file uploaded | 31 December 2014 03:31 CET | Original file | https://www.mdpi.com/2073-8994/6/4/851/xml |
| article pdf uploaded. | 20 October 2014 15:40 CEST | Version of Record | https://www.mdpi.com/2073-8994/6/4/851/pdf |
