| article html file updated | 6 February 2020 05:26 CET | Update | https://www.mdpi.com/2218-273X/3/4/923 |
| article html file updated | 7 May 2019 22:19 CEST | Update | - |
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| article html file updated | 14 March 2018 17:59 CET | Update | - |
| article html file updated | 19 August 2015 09:16 CEST | Update | - |
| article html file updated | 28 April 2014 10:36 CEST | Original file | - |
| article xml file uploaded | 28 April 2014 10:36 CEST | Original file | https://www.mdpi.com/2218-273X/3/4/923/xml |
| article pdf uploaded. | 8 November 2013 17:27 CET | Version of Record | https://www.mdpi.com/2218-273X/3/4/923/pdf |
