| article html file updated | 9 February 2020 21:35 CET | Update | https://www.mdpi.com/2079-9268/8/2/21 |
| article html file updated | 4 October 2019 15:00 CEST | Update | - |
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| article html file updated | 15 June 2018 03:41 CEST | Original file | - |
| article pdf uploaded. | 15 June 2018 03:40 CEST | Version of Record | https://www.mdpi.com/2079-9268/8/2/21/pdf |
| article xml uploaded. | 15 June 2018 03:40 CEST | Update | https://www.mdpi.com/2079-9268/8/2/21/xml |
| article xml file uploaded | 15 June 2018 03:40 CEST | Original file | - |
