| article html file updated | 30 August 2025 01:20 CEST | Update | https://www.mdpi.com/2218-1997/3/4/69 |
| article html file updated | 16 July 2022 06:38 CEST | Update | N/A |
| article html file updated | 8 February 2020 17:42 CET | Update | N/A |
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| article html file updated | 12 October 2017 08:38 CEST | Original file | N/A |
| article xml uploaded. | 12 October 2017 08:36 CEST | Original file | https://www.mdpi.com/2218-1997/3/4/69/xml |
| article pdf uploaded. | 12 October 2017 08:36 CEST | Updated version of record | https://www.mdpi.com/2218-1997/3/4/69/pdf |
| article pdf uploaded. | 2 October 2017 13:14 CEST | Version of Record | https://www.mdpi.com/2218-1997/3/4/69/pdf-vor |
