| article html file updated | 6 February 2020 22:16 CET | Update | https://www.mdpi.com/1424-8220/15/9/21581 |
| article html file updated | 6 May 2019 12:28 CEST | Update | - |
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| article html file updated | 9 October 2015 11:58 CEST | Update | - |
| article xml file uploaded | 9 October 2015 11:58 CEST | Update | https://www.mdpi.com/1424-8220/15/9/21581/xml |
| article html file updated | 16 September 2015 13:38 CEST | Original file | - |
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| article pdf uploaded. | 28 August 2015 14:14 CEST | Version of Record | https://www.mdpi.com/1424-8220/15/9/21581/pdf |
