| article html file updated | 9 February 2020 08:06 CET | Update | https://www.mdpi.com/2409-9287/3/1/4 |
| article html file updated | 1 May 2019 15:20 CEST | Update | - |
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| article xml uploaded. | 28 February 2018 13:53 CET | Original file | https://www.mdpi.com/2409-9287/3/1/4/xml |
| article pdf uploaded. | 28 February 2018 13:53 CET | Version of Record | https://www.mdpi.com/2409-9287/3/1/4/pdf |
