| article html file updated | 8 February 2020 23:30 CET | Update | https://www.mdpi.com/2079-9721/5/4/30 |
| article html file updated | 29 September 2019 01:50 CEST | Update | N/A |
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| article xml uploaded. | 8 December 2017 10:05 CET | Update | https://www.mdpi.com/2079-9721/5/4/30/xml |
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| article pdf uploaded. | 8 December 2017 10:05 CET | Version of Record | https://www.mdpi.com/2079-9721/5/4/30/pdf |