| article html file updated | 8 February 2020 14:57 CET | Update | https://www.mdpi.com/1424-8220/17/9/1991 |
| article html file updated | 26 September 2019 20:48 CEST | Update | - |
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| article html file updated | 30 September 2017 14:40 CEST | Update | - |
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| article xml uploaded. | 31 August 2017 11:31 CEST | Original file | https://www.mdpi.com/1424-8220/17/9/1991/xml |
| article pdf uploaded. | 31 August 2017 11:31 CEST | Version of Record | https://www.mdpi.com/1424-8220/17/9/1991/pdf |
