| article html file updated | 8 February 2020 21:27 CET | Update | https://www.mdpi.com/2075-1680/6/4/30 |
| article html file updated | 28 September 2019 13:12 CEST | Update | - |
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| article html file updated | 20 November 2017 08:06 CET | Original file | - |
| article xml uploaded. | 20 November 2017 08:05 CET | Original file | https://www.mdpi.com/2075-1680/6/4/30/xml |
| article pdf uploaded. | 20 November 2017 08:05 CET | Version of Record | https://www.mdpi.com/2075-1680/6/4/30/pdf |
