| article html file updated | 7 February 2020 22:07 CET | Update | https://www.mdpi.com/2227-9067/4/1/6 |
| article html file updated | 23 September 2019 00:59 CEST | Update | - |
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| article html file updated | 9 February 2017 07:57 CET | Update | - |
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| article xml uploaded. | 24 January 2017 15:35 CET | Original file | https://www.mdpi.com/2227-9067/4/1/6/xml |
| article pdf uploaded. | 24 January 2017 15:35 CET | Version of Record | https://www.mdpi.com/2227-9067/4/1/6/pdf |
