| article html file updated | 6 February 2020 01:32 CET | Update | https://www.mdpi.com/2218-1989/3/2/259 |
| article html file updated | 8 May 2019 06:14 CEST | Update | - |
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| article html file updated | 17 June 2015 08:27 CEST | Update | - |
| article html file updated | 7 January 2014 12:29 CET | Original file | - |
| article xml file uploaded | 7 January 2014 12:29 CET | Original file | https://www.mdpi.com/2218-1989/3/2/259/xml |
| article pdf uploaded. | 15 April 2013 15:48 CEST | Version of Record | https://www.mdpi.com/2218-1989/3/2/259/pdf |
