| article html file updated | 6 February 2020 15:00 CET | Update | https://www.mdpi.com/2077-1312/3/1/21 |
| article html file updated | 7 May 2019 02:50 CEST | Update | - |
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| article html file updated | 27 October 2017 11:32 CEST | Update | - |
| article html file updated | 21 August 2015 05:25 CEST | Update | - |
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| article xml file uploaded | 20 January 2015 08:36 CET | Original file | https://www.mdpi.com/2077-1312/3/1/21/xml |
| article pdf uploaded. | 8 January 2015 10:40 CET | Version of Record | https://www.mdpi.com/2077-1312/3/1/21/pdf |
