| article html file updated | 29 August 2025 22:39 CEST | Update | https://www.mdpi.com/1999-4907/7/2/31 |
| article html file updated | 16 July 2022 01:42 CEST | Update | N/A |
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| article pdf uploaded. | 2 February 2016 14:19 CET | Updated version of record | https://www.mdpi.com/1999-4907/7/2/31/pdf |
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| article xml uploaded. | 29 January 2016 11:55 CET | Original file | https://www.mdpi.com/1999-4907/7/2/31/xml |