| article html file updated | 8 February 2020 05:27 CET | Update | https://www.mdpi.com/2227-9059/5/2/21 |
| article html file updated | 24 September 2019 17:43 CEST | Update | - |
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| article xml uploaded. | 9 May 2017 15:25 CEST | Original file | https://www.mdpi.com/2227-9059/5/2/21/xml |
| article pdf uploaded. | 9 May 2017 15:25 CEST | Version of Record | https://www.mdpi.com/2227-9059/5/2/21/pdf |
