| article html file updated | 8 February 2020 19:58 CET | Update | https://www.mdpi.com/2071-1050/9/11/1991 |
| article html file updated | 28 September 2019 03:28 CEST | Update | - |
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| article html file updated | 30 November 2017 12:23 CET | Update | - |
| article html file updated | 31 October 2017 14:15 CET | Original file | - |
| article xml uploaded. | 31 October 2017 14:13 CET | Original file | https://www.mdpi.com/2071-1050/9/11/1991/xml |
| article pdf uploaded. | 31 October 2017 14:13 CET | Version of Record | https://www.mdpi.com/2071-1050/9/11/1991/pdf |
