| article html file updated | 7 February 2020 16:37 CET | Update | https://www.mdpi.com/2227-7102/6/4/34 |
| article html file updated | 22 September 2019 03:24 CEST | Update | - |
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| article html file updated | 19 October 2016 11:53 CEST | Original file | - |
| article xml uploaded. | 19 October 2016 11:52 CEST | Original file | https://www.mdpi.com/2227-7102/6/4/34/xml |
| article pdf uploaded. | 19 October 2016 11:52 CEST | Version of Record | https://www.mdpi.com/2227-7102/6/4/34/pdf |
