| article html file updated | 13 August 2026 16:40 CEST | Update | https://www.mdpi.com/2218-6581/4/1/63 |
| article html file updated | 6 February 2020 16:54 CET | Update | N/A |
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| article pdf uploaded. | 23 March 2015 15:39 CET | Version of Record | https://www.mdpi.com/2218-6581/4/1/63/pdf |
