| article html file updated | 24 December 2025 13:46 CET | Update | https://www.mdpi.com/2076-3921/4/1/68 |
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| article html file updated | 21 August 2015 06:19 CEST | Original file | N/A |
| article pdf uploaded. | 22 January 2015 14:21 CET | Version of Record | https://www.mdpi.com/2076-3921/4/1/68/pdf |
