| article html file updated | 9 February 2020 02:29 CET | Update | https://www.mdpi.com/2227-7390/6/1/8 |
| article html file updated | 2 May 2019 03:26 CEST | Update | - |
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| article xml uploaded. | 9 January 2018 17:30 CET | Update | https://www.mdpi.com/2227-7390/6/1/8/xml |
| article pdf uploaded. | 9 January 2018 17:30 CET | Version of Record | https://www.mdpi.com/2227-7390/6/1/8/pdf |
