| article html file updated | 8 February 2020 04:22 CET | Update | https://www.mdpi.com/2227-9067/4/5/31 |
| article html file updated | 24 September 2019 12:13 CEST | Update | - |
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| article html file updated | 31 May 2017 06:35 CEST | Update | - |
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| article xml uploaded. | 25 April 2017 16:25 CEST | Original file | https://www.mdpi.com/2227-9067/4/5/31/xml |
| article pdf uploaded. | 25 April 2017 16:25 CEST | Version of Record | https://www.mdpi.com/2227-9067/4/5/31/pdf |
