| article html file updated | 7 February 2020 17:31 CET | Update | https://www.mdpi.com/2079-6412/6/4/56 |
| article html file updated | 22 September 2019 04:44 CEST | Update | - |
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| article html file updated | 28 December 2016 08:34 CET | Update | - |
| article html file updated | 4 November 2016 10:27 CET | Original file | - |
| article xml uploaded. | 4 November 2016 10:25 CET | Original file | https://www.mdpi.com/2079-6412/6/4/56/xml |
| article pdf uploaded. | 4 November 2016 10:25 CET | Version of Record | https://www.mdpi.com/2079-6412/6/4/56/pdf |
