| article html file updated | 7 February 2020 23:20 CET | Update | https://www.mdpi.com/2227-7072/5/1/6 |
| article html file updated | 23 September 2019 07:37 CEST | Update | - |
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| article html file updated | 29 March 2017 10:25 CEST | Update | - |
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| article xml uploaded. | 14 February 2017 10:23 CET | Original file | https://www.mdpi.com/2227-7072/5/1/6/xml |
| article pdf uploaded. | 14 February 2017 10:23 CET | Version of Record | https://www.mdpi.com/2227-7072/5/1/6/pdf |
