| article html file updated | 9 February 2020 01:03 CET | Update | https://www.mdpi.com/2227-7072/6/1/1 |
| article html file updated | 2 May 2019 06:27 CEST | Update | - |
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| article html file updated | 23 December 2017 13:08 CET | Original file | - |
| article xml uploaded. | 23 December 2017 13:07 CET | Original file | https://www.mdpi.com/2227-7072/6/1/1/xml |
| article pdf uploaded. | 23 December 2017 13:07 CET | Version of Record | https://www.mdpi.com/2227-7072/6/1/1/pdf |
