| article html file updated | 6 February 2020 05:57 CET | Update | https://www.mdpi.com/2220-9964/2/4/1136 |
| article html file updated | 7 May 2019 21:20 CEST | Update | - |
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| article html file updated | 19 August 2015 12:12 CEST | Update | - |
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| article xml file uploaded | 10 November 2014 07:33 CET | Original file | https://www.mdpi.com/2220-9964/2/4/1136/xml |
| article pdf uploaded. | 3 December 2013 15:19 CET | Version of Record | https://www.mdpi.com/2220-9964/2/4/1136/pdf |
