| article html file updated | 6 February 2020 06:19 CET | Update | https://www.mdpi.com/2072-6643/6/1/15 |
| article html file updated | 7 May 2019 20:39 CEST | Update | - |
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| article html file updated | 19 August 2015 14:17 CEST | Update | - |
| article html file updated | 17 February 2014 12:25 CET | Original file | - |
| article xml file uploaded | 17 February 2014 12:25 CET | Original file | https://www.mdpi.com/2072-6643/6/1/15/xml |
| article pdf uploaded. | 19 December 2013 11:51 CET | Version of Record | https://www.mdpi.com/2072-6643/6/1/15/pdf |
