| article html file updated | 9 February 2020 17:45 CET | Update | https://www.mdpi.com/2227-9059/6/2/57 |
| article html file updated | 3 October 2019 15:17 CEST | Update | - |
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| article html file updated | 16 May 2018 07:54 CEST | Original file | - |
| article pdf uploaded. | 16 May 2018 07:53 CEST | Version of Record | https://www.mdpi.com/2227-9059/6/2/57/pdf |
| article xml uploaded. | 16 May 2018 07:53 CEST | Update | https://www.mdpi.com/2227-9059/6/2/57/xml |
| article xml file uploaded | 16 May 2018 07:53 CEST | Original file | - |