| article xml uploaded. | 10 January 2024 08:23 CET | Update | https://www.mdpi.com/2073-4468/4/1/12/xml |
| article html file updated | 6 February 2020 15:27 CET | Update | https://www.mdpi.com/2073-4468/4/1/12 |
| article html file updated | 7 May 2019 01:57 CEST | Update | - |
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| article html file updated | 21 August 2015 06:29 CEST | Update | - |
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| article pdf uploaded. | 26 January 2015 11:39 CET | Version of Record | https://www.mdpi.com/2073-4468/4/1/12/pdf |
