| article html file updated | 31 August 2025 07:53 CEST | Update | https://www.mdpi.com/2218-1997/6/1/9 |
| article html file updated | 19 July 2022 20:26 CEST | Update | - |
| article html file updated | 14 February 2020 23:00 CET | Update | - |
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| article pdf uploaded. | 13 January 2020 04:49 CET | Updated version of record | https://www.mdpi.com/2218-1997/6/1/9/pdf |
| article xml uploaded. | 13 January 2020 04:49 CET | Update | https://www.mdpi.com/2218-1997/6/1/9/xml |
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| article pdf uploaded. | 31 December 2019 11:57 CET | Updated version of record | https://www.mdpi.com/2218-1997/6/1/9/pdf-vor |
| article pdf uploaded. | 31 December 2019 11:08 CET | Version of Record | https://www.mdpi.com/2218-1997/6/1/9/pdf-vor |
| article xml file uploaded | 31 December 2019 11:08 CET | Original file | - |
