| article html file updated | 11 February 2020 07:44 CET | Update | https://www.mdpi.com/2227-9709/6/1/3 |
| article html file updated | 27 April 2019 09:12 CEST | Update | - |
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| article xml uploaded. | 9 January 2019 15:29 CET | Original file | https://www.mdpi.com/2227-9709/6/1/3/xml |
| article pdf uploaded. | 9 January 2019 15:29 CET | Version of Record | https://www.mdpi.com/2227-9709/6/1/3/pdf |
