| article html file updated | 8 February 2020 06:33 CET | Update | https://new.mdpi.com/2076-0752/6/2/8 |
| article html file updated | 24 September 2019 23:32 CEST | Update | - |
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| article html file updated | 30 June 2017 09:06 CEST | Update | - |
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| article xml uploaded. | 23 June 2017 04:41 CEST | Original file | https://new.mdpi.com/2076-0752/6/2/8/xml |
| article pdf uploaded. | 24 May 2017 11:06 CEST | Version of Record | https://new.mdpi.com/2076-0752/6/2/8/pdf |
