| article html file updated | 10 February 2020 05:26 CET | Update | https://www.mdpi.com/2032-6653/9/2/31 |
| article html file updated | 6 October 2019 13:27 CEST | Update | N/A |
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| article html file updated | 10 August 2018 13:21 CEST | Original file | N/A |
| article pdf uploaded. | 10 August 2018 13:19 CEST | Updated version of record | https://www.mdpi.com/2032-6653/9/2/31/pdf |
| article xml uploaded. | 10 August 2018 13:19 CEST | Update | https://www.mdpi.com/2032-6653/9/2/31/xml |
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