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| article pdf uploaded. | 25 November 2019 11:11 CET | Updated version of record | https://www.mdpi.com/2227-9032/7/4/137/pdf |
| article xml uploaded. | 25 November 2019 11:11 CET | Update | https://www.mdpi.com/2227-9032/7/4/137/xml |
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| article html file updated | 6 November 2019 13:05 CET | Original file | - |
| article pdf uploaded. | 6 November 2019 13:03 CET | Version of Record | https://www.mdpi.com/2227-9032/7/4/137/pdf-vor |
| article xml uploaded. | 6 November 2019 13:03 CET | Update | - |
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