| article html file updated | 12 August 2026 20:23 CEST | Update | https://www.mdpi.com/1999-5903/5/4/460 |
| article html file updated | 6 February 2020 04:33 CET | Update | N/A |
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| article html file updated | 26 July 2017 05:50 CEST | Original file | N/A |
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| article pdf uploaded. | 25 September 2013 18:27 CEST | Version of Record | https://www.mdpi.com/1999-5903/5/4/460/pdf |
