| article html file updated | 6 February 2020 06:15 CET | Update | https://www.mdpi.com/2077-0375/3/4/424 |
| article html file updated | 7 May 2019 20:46 CEST | Update | N/A |
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| article xml file uploaded | 18 March 2014 09:53 CET | Original file | https://www.mdpi.com/2077-0375/3/4/424/xml |
| article supplementary file uploaded. | 16 December 2013 18:59 CET | - | https://www.mdpi.com/2077-0375/3/4/424#supplementary |
| article pdf uploaded. | 16 December 2013 18:59 CET | Version of Record | https://www.mdpi.com/2077-0375/3/4/424/pdf |