| article html file updated | 7 February 2020 06:16 CET | Update | https://www.mdpi.com/2075-4663/4/2/21 |
| article html file updated | 21 September 2019 13:44 CEST | Update | - |
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| article xml uploaded. | 23 March 2016 09:21 CET | Original file | https://www.mdpi.com/2075-4663/4/2/21/xml |
| article pdf uploaded. | 23 March 2016 09:21 CET | Version of Record | https://www.mdpi.com/2075-4663/4/2/21/pdf |
