| article html file updated | 9 February 2020 02:59 CET | Update | https://www.mdpi.com/2227-9709/5/1/6 |
| article html file updated | 29 September 2019 21:35 CEST | Update | - |
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| article xml uploaded. | 13 January 2018 11:18 CET | Original file | https://www.mdpi.com/2227-9709/5/1/6/xml |
| article pdf uploaded. | 13 January 2018 11:18 CET | Version of Record | https://www.mdpi.com/2227-9709/5/1/6/pdf |
