| article html file updated | 8 February 2020 18:42 CET | Update | https://www.mdpi.com/2227-7072/5/4/22 |
| article html file updated | 27 September 2019 19:52 CEST | Update | - |
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| article html file updated | 2 January 2018 13:29 CET | Update | - |
| article html file updated | 17 October 2017 15:18 CEST | Original file | - |
| article xml uploaded. | 17 October 2017 15:17 CEST | Original file | https://www.mdpi.com/2227-7072/5/4/22/xml |
| article pdf uploaded. | 17 October 2017 15:17 CEST | Version of Record | https://www.mdpi.com/2227-7072/5/4/22/pdf |
