| article html file updated | 24 December 2025 13:53 CET | Update | https://www.mdpi.com/1996-1944/9/2/91 |
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| article pdf uploaded. | 2 February 2016 12:52 CET | Version of Record | https://www.mdpi.com/1996-1944/9/2/91/pdf |
| article xml uploaded. | 2 February 2016 12:52 CET | Original file | https://www.mdpi.com/1996-1944/9/2/91/xml |