| article html file updated | 30 August 2025 02:39 CEST | Update | https://www.mdpi.com/2218-1997/4/2/39 |
| article html file updated | 16 July 2022 09:19 CEST | Update | N/A |
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| article html file updated | 22 February 2018 11:17 CET | Original file | N/A |
| article xml uploaded. | 22 February 2018 11:16 CET | Original file | https://www.mdpi.com/2218-1997/4/2/39/xml |
| article pdf uploaded. | 22 February 2018 11:16 CET | Updated version of record | https://www.mdpi.com/2218-1997/4/2/39/pdf |
| article pdf uploaded. | 16 February 2018 15:18 CET | Version of Record | https://www.mdpi.com/2218-1997/4/2/39/pdf-vor |
