| article html file updated | 8 February 2020 21:33 CET | Update | https://www.mdpi.com/1999-4923/9/4/52 |
| article html file updated | 28 September 2019 13:51 CEST | Update | - |
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| article html file updated | 18 November 2017 10:12 CET | Original file | - |
| article xml uploaded. | 18 November 2017 10:10 CET | Original file | https://www.mdpi.com/1999-4923/9/4/52/xml |
| article pdf uploaded. | 18 November 2017 10:10 CET | Version of Record | https://www.mdpi.com/1999-4923/9/4/52/pdf |
