| article html file updated | 7 February 2020 08:49 CET | Update | https://www.mdpi.com/2227-9067/3/2/9 |
| article html file updated | 21 September 2019 17:20 CEST | Update | N/A |
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| article xml uploaded. | 17 May 2016 10:48 CEST | Original file | https://www.mdpi.com/2227-9067/3/2/9/xml |
| article pdf uploaded. | 17 May 2016 10:48 CEST | Version of Record | https://www.mdpi.com/2227-9067/3/2/9/pdf |
