| article html file updated | 8 February 2020 22:32 CET | Update | https://www.mdpi.com/2218-6581/6/4/36 |
| article html file updated | 28 September 2019 20:04 CEST | Update | - |
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| article html file updated | 29 November 2017 10:11 CET | Original file | - |
| article xml uploaded. | 29 November 2017 10:10 CET | Original file | https://www.mdpi.com/2218-6581/6/4/36/xml |
| article pdf uploaded. | 29 November 2017 10:10 CET | Version of Record | https://www.mdpi.com/2218-6581/6/4/36/pdf |
