| article html file updated | 24 December 2025 16:53 CET | Update | https://www.mdpi.com/2218-1997/6/1/4 |
| article html file updated | 31 August 2025 07:30 CEST | Update | N/A |
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| article html file updated | 14 February 2020 21:47 CET | Update | N/A |
| article html file updated | 30 December 2019 04:22 CET | Original file | N/A |
| article pdf uploaded. | 30 December 2019 04:21 CET | Updated version of record | https://www.mdpi.com/2218-1997/6/1/4/pdf |
| article xml uploaded. | 30 December 2019 04:21 CET | Update | https://www.mdpi.com/2218-1997/6/1/4/xml |
| article xml file uploaded | 30 December 2019 04:21 CET | Update | N/A |
| article pdf uploaded. | 25 December 2019 16:17 CET | Version of Record | https://www.mdpi.com/2218-1997/6/1/4/pdf-vor |
| article xml file uploaded | 25 December 2019 16:17 CET | Original file | N/A |