| article html file updated | 8 February 2020 18:45 CET | Update | https://www.mdpi.com/2076-0817/6/4/50 |
| article html file updated | 27 September 2019 20:11 CEST | Update | - |
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| article html file updated | 18 October 2017 10:50 CEST | Original file | - |
| article xml uploaded. | 18 October 2017 10:48 CEST | Original file | https://www.mdpi.com/2076-0817/6/4/50/xml |
| article pdf uploaded. | 18 October 2017 10:48 CEST | Version of Record | https://www.mdpi.com/2076-0817/6/4/50/pdf |
