| article html file updated | 7 February 2020 06:59 CET | Update | https://www.mdpi.com/2225-1154/4/2/20 |
| article html file updated | 5 May 2019 19:15 CEST | Update | - |
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| article html file updated | 1 July 2016 10:39 CEST | Update | - |
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| article xml uploaded. | 8 April 2016 09:38 CEST | Original file | https://www.mdpi.com/2225-1154/4/2/20/xml |
| article pdf uploaded. | 8 April 2016 09:38 CEST | Version of Record | https://www.mdpi.com/2225-1154/4/2/20/pdf |
