| article html file updated | 8 February 2020 18:07 CET | Update | https://www.mdpi.com/2223-7747/6/4/47 |
| article html file updated | 27 September 2019 16:02 CEST | Update | - |
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| article html file updated | 11 October 2017 12:54 CEST | Original file | - |
| article xml uploaded. | 11 October 2017 12:53 CEST | Original file | https://www.mdpi.com/2223-7747/6/4/47/xml |
| article pdf uploaded. | 11 October 2017 12:53 CEST | Version of Record | https://www.mdpi.com/2223-7747/6/4/47/pdf |
