| article html file updated | 8 February 2020 05:56 CET | Update | https://www.mdpi.com/2218-1989/7/2/18 |
| article html file updated | 24 September 2019 20:18 CEST | Update | - |
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| article xml uploaded. | 16 May 2017 08:49 CEST | Original file | https://www.mdpi.com/2218-1989/7/2/18/xml |
| article pdf uploaded. | 16 May 2017 08:49 CEST | Version of Record | https://www.mdpi.com/2218-1989/7/2/18/pdf |
