| article html file updated | 9 February 2020 02:36 CET | Update | https://www.mdpi.com/2223-7747/7/1/4 |
| article html file updated | 29 September 2019 19:31 CEST | Update | - |
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| article xml uploaded. | 10 January 2018 15:13 CET | Original file | https://www.mdpi.com/2223-7747/7/1/4/xml |
| article pdf uploaded. | 10 January 2018 15:13 CET | Version of Record | https://www.mdpi.com/2223-7747/7/1/4/pdf |
