| article html file updated | 9 February 2020 01:33 CET | Update | https://www.mdpi.com/2076-0760/7/1/6 |
| article html file updated | 29 September 2019 13:44 CEST | Update | - |
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| article html file updated | 29 December 2017 16:15 CET | Original file | - |
| article xml uploaded. | 29 December 2017 16:14 CET | Original file | https://www.mdpi.com/2076-0760/7/1/6/xml |
| article pdf uploaded. | 29 December 2017 16:14 CET | Version of Record | https://www.mdpi.com/2076-0760/7/1/6/pdf |
