| article html file updated | 9 February 2020 01:21 CET | Update | https://www.mdpi.com/2227-9067/5/1/4 |
| article html file updated | 29 September 2019 12:35 CEST | Update | - |
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| article xml uploaded. | 27 December 2017 15:40 CET | Original file | https://www.mdpi.com/2227-9067/5/1/4/xml |
| article pdf uploaded. | 27 December 2017 15:40 CET | Version of Record | https://www.mdpi.com/2227-9067/5/1/4/pdf |
