| article html file updated | 7 February 2020 20:19 CET | Update | https://www.mdpi.com/2073-4344/7/1/4 |
| article html file updated | 22 September 2019 15:16 CEST | Update | - |
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| article html file updated | 26 December 2016 10:49 CET | Original file | - |
| article xml uploaded. | 26 December 2016 10:48 CET | Original file | https://www.mdpi.com/2073-4344/7/1/4/xml |
| article pdf uploaded. | 26 December 2016 10:48 CET | Version of Record | https://www.mdpi.com/2073-4344/7/1/4/pdf |
