| article html file updated | 14 August 2026 21:00 CEST | Update | https://www.mdpi.com/2225-1154/6/1/4 |
| article html file updated | 9 February 2020 02:50 CET | Update | N/A |
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| article pdf uploaded. | 26 January 2018 06:35 CET | Updated version of record | https://www.mdpi.com/2225-1154/6/1/4/pdf |
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