| article html file updated | 8 February 2020 02:13 CET | Update | https://www.mdpi.com/2075-4663/5/2/21 |
| article html file updated | 24 September 2019 00:04 CEST | Update | - |
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| article html file updated | 24 March 2017 14:40 CET | Original file | - |
| article xml uploaded. | 24 March 2017 14:38 CET | Original file | https://www.mdpi.com/2075-4663/5/2/21/xml |
| article pdf uploaded. | 24 March 2017 14:38 CET | Version of Record | https://www.mdpi.com/2075-4663/5/2/21/pdf |
