| article html file updated | 9 February 2020 03:32 CET | Update | https://www.mdpi.com/1999-4907/9/1/40 |
| article html file updated | 30 September 2019 00:54 CEST | Update | - |
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| article html file updated | 18 January 2018 15:58 CET | Original file | - |
| article xml uploaded. | 18 January 2018 15:57 CET | Original file | https://www.mdpi.com/1999-4907/9/1/40/xml |
| article pdf uploaded. | 18 January 2018 15:57 CET | Version of Record | https://www.mdpi.com/1999-4907/9/1/40/pdf |
