| article html file updated | 8 February 2020 02:59 CET | Update | https://www.mdpi.com/2077-1444/8/4/56 |
| article html file updated | 4 May 2019 03:25 CEST | Update | - |
| article html file updated | 28 April 2017 07:13 CEST | Update | - |
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| article xml uploaded. | 5 April 2017 14:32 CEST | Original file | https://www.mdpi.com/2077-1444/8/4/56/xml |
| article pdf uploaded. | 5 April 2017 14:32 CEST | Version of Record | https://www.mdpi.com/2077-1444/8/4/56/pdf |
